Communication & Collaboration

Tools for Teams and Collaboration

3Cols - A free cloud-based code snippet manager for personal and collaborative code.
BookmarkOS.com - Free all-on-one bookmark manager, tab manager, and task manager in a customizable online desktop with folder collaboration.
Braid - Chat app designed for teams. Free for public access group, unlimited users, history, and integrations. also, it provides a self-hostable open-source version.
Calendly - Calendly is the tool for connecting and scheduling meetings. The free plan provides 1 Calendar connection per user and Unlimited sessions. Desktop and Mobile apps are also offered.
cally.com - Find the perfect time and date for a meeting. Simple to use, works great for small and large groups.
cDox - Private document editor hosted in Canada. Write, format, collaborate, and publish documents with clean public links. Data is never used for AI training. Free plan includes 50 MB storage, up to 3 public links, and export to PDF, Word, and Markdown.
Chanty.com - Chanty is another alternative to Slack. It has a free forever plan for small teams (up to 10) with unlimited public and private conversations, searchable history, unlimited 1:1 audio calls, unlimited voice messages, ten integrations, and 20 GB storage per team.
DevToolLab - Online developer tools offering free access to all basic tools, with the ability to auto save one entry per tool, standard processing speed, and community support.
Discord - Chat with public/private rooms. Markdown text, voice, video, and screen sharing capabilities. Free for unlimited users.
Dubble - Free Step-by-Step Guide creator. Take screenshots, document processes and colloborate with your team. Also supports async screen recording.
Duckly - Talk and collaborate in real time with your team. Pair programming with IDE, terminal sharing, voice, video, and screen sharing. Free for small teams.
element.io - A decentralized and open-source communication tool built on Matrix. Group chats, direct messaging, encrypted file transfers, voice and video chats, and easy integration with other services.
evernote.com - Tool for organizing information. Share your notes and work together with others
Fibery - Connected workspace platform. Free for single users, up to 2 GB disk space.
Fibo - A free online realtime scrum poker tool for agile teams that lets unlimited members estimate story points for faster planning.
Fizzy - Kanban-based platform for project management and issue tracking. Create public boards, set up webhooks, use card stamping, and track unlimited users - free for up to 1000 items.
flat.social - Interactive customizable spaces for team meetings & happy hours socials. Unlimited meetings, free up to 8 concurrent users.
flock.com - A faster way for your team to communicate. Free Unlimited Messages, Channels, Users, Apps & Integrations
GitBook - Platform for capturing and documenting technical knowledge - from product docs to internal knowledge bases and APIs. Free plan for individual developers.
GitDailies - Daily reports of your team's Commit and Pull Request activity on GitHub. Includes Push visualizer, peer recognition system, and custom alert builder. The free tier has unlimited users, three repos, and 3 alert configs.
gitter.im - Chat, for GitHub. Unlimited public and private rooms, free for teams of up to 25
gokanban.io - Syntax-based, no registration Kanban Board for fast use. Free with no limitations.
Hackmd.io - Real time collaboration & writing tool for markdown format docs/files. Like Google Docs but for markdown files. Free unlimited number of "notes", but the number of collaborators (invitee) for private notes & template [will be limited](https://hackmd.io/pricing).
HeySpace - Task management tool with chat, calendar, timeline and video calls. Free for up to 5 users.
Huly - All-in-One Project Management Platform (alternative to Linear, Jira, Slack, Notion, Motion) - unlimited users, 10GB storage per workspace, 10GB video(audio) traffic.
Keybase - Keybase is a FOSS alternative to Slack; it keeps everyone's chats and files safe, from families to communities to companies.
Linkinize - Bookmark manager for teams with tagging, multi-workspaces, and collaboration. Free plan includes 4 workspaces and 10 team members.
Lockitbot - Reserve and lock shared resources within Slack like Rooms, Dev environments , servers etc. Free for upto 2 resources
meet.jit.si - One-click video conversations, and screen sharing, for free
MeetBackdrops - Free HD virtual backgrounds for video calls on Zoom, Microsoft Teams, and Google Meet. 1,000+ studio-designed environments with no signup required.
Miro - Scalable, secure, cross-device, and enterprise-ready collaboration whiteboard for distributed teams. With a freemium plan.
Notion - Notion is a note-taking and collaboration application with markdown support that integrates tasks, wikis, and databases. The company describes the app as an all-in-one workspace for note-taking, project management and task management. In addition to cross-platform apps, it can be accessed via most web browsers.
Nuclino - A lightweight and collaborative wiki for all your team's knowledge, docs, and notes. Free plan with all essential features, up to 50 items, and 5GB storage.
OnlineInterview.io - Free code interview platform with embedded video chat, drawing board, and online code editor where you can compile and run your code on the browser. You can create a remote interview room with just one click.
paste.sh - This is a JavaScript and the Crypto based simple paste site.
Pastefy - Beautiful and simple Pastebin with optional Client-Encryption, Multitab-Pastes, an API, a highlighted Editor and more.
Pendulums - Pendulums is a free time tracking tool that helps you manage your time in a better manner with an easy-to-use interface and valuable statistics.
Proton Pass - Password manager with built-in email aliases, 2FA authenticator, sharing and passkeys. Available on web, browser extension, and mobile app and desktop.
Pullflow - Pullflow offers an AI-enhanced platform for code review collaboration across GitHub, Slack, and VS Code.
Pumble - Free team chat app. Unlimited users and message history, free forever.
Quidlo Timesheets - A simple timesheet and time tracking app for teams. The free plan has time tracking and generating reports features for up to 10 users.
Raindrop.io - Private and secure bookmarking app for macOS, Windows, Android, iOS, and Web. Free Unlimited Bookmarks and Collaboration.
Revolt.chat - An OpenSource alternative for[Discord](https://discord.com/), that respects your privacy. It also have most proprietary features from discord for free. Revolt is a all in one application that is secure and fast, while being 100% free. every features are free. They also have (official & unofficial) plugins support unlike most main-stream chatting applications.
RightFeature - Easily collect feedback from your customers, turn customer feedback into your product roadmap. Collect, prioritize, and ship features that actually matter to your users.
Rocket.Chat - Open-source communication platform with Omnichannel features, Matrix Federation, Bridge with others apps, Unlimited messaging, and Full messaging history.
ruttl.com - The best all-in-one feedback tool to collect digital feedback and review websites, PDFs, and images.
Screen Sharing via Browser - Free screen sharing tool, share your screen with collabrators right from your browser, no download or registration needed. For free.
seafile.com - Private or cloud storage, file sharing, sync, discussions. The cloud version has just 1 GB
SiteDots - Share feedback for website projects directly on your website, no emulation, canvas or workarounds. Completely functional free tier.
Slab - A modern knowledge management service for teams. Free for up to 10 users.
slack.com - Free for unlimited users with some feature limitations
StatusPile - A status page of status pages. Could you track the status pages of your upstream providers?
Stickies - Visual collaboration app used for brainstorming, content curation, and notes. Free for up to 3 Walls, unlimited users, and 1 GB storage.
talky.io - Free group video chat. Anonymous. Peer‑to‑peer. No plugins, signup, or payment required
Teamcamp - All-in-one project management application for software development companies.
Teamhood - Free Project, Task, and Issue-tracking software. Supports Kanban with Swimlanes and full Scrum implementation. Has integrated time tracking. Free for five users and three project portfolios.
Teamplify - improve team development processes with Team Analytics and Smart Daily Standup. Includes full-featured Time Off management for remote-first teams. Free for small groups of up to 5 users.
Telegram - Telegram is for everyone who wants fast, reliable messaging and calls. Business users and small teams may like the large groups, usernames, desktop apps, and powerful file-sharing options.
Tencent RTC - Tencent Real-Time Communication (TRTC) offers solutions for group audio/video calls.10,000 free minutes/month for the first year.
TimeCamp - Free time tracking software for unlimited users. Easily integrates with PM tools like Jira, Trello, Asana, etc.
tldraw.com - Free open-source white-boarding and diagramming tool with intelligent arrows, snapping, sticky notes, and SVG export features. Multiplayer mode for collaborative editing. Free official VS Code extension available as well.
transfernow - simplest, fastest and safest interface to transfer and share files. Send photos, videos and other large files without a manditory subscription.
Tugboat - Preview every pull request, automated and on-demand. Free for all, complimentary Nano tier for non-profits.
twist.com - An asynchronous-friendly team communication app where conversations stay organized and on-topic. Free and Unlimited plans are available. Discounts are provided for eligible teams.
userforge.com - Interconnected online personas, user stories and context mapping. Helps keep design and dev in sync free for up to 3 personas and two collaborators.
Visual Debug - A Visual feedback tool for better client-dev communication
Webex - Video meetings with a free plan offering 40 minutes per meeting with 100 attendees.
Webvizio - Website feedback tool, website review software, and bug reporting tool for streamlining web development collaboration on tasks directly on live websites and web apps, images, PDFs, and design files.
whereby.com - One-click video conversations, for free (formerly known as appear.in)
windmill.dev - Windmill is an open-source developer platform to quickly build production-grade multi-step automation and internal apps from minimal Python and Typescript scripts. As a free user, you can create and be a member of at most three non-premium workspaces.
wistia.com - Video hosting with viewer analytics, HD video delivery, and marketing tools to help understand your visitors, 25 videos, and Wistia branded player
wormhol.org - Straightforward file sharing service. Share unlimited files up to 5GB with as many peers as you want.
Wormhole - Share files up to 5GB with end-to-end encryption for up to 24hours. For files larger than 5 GB, it uses peer-to-peer transfer to send your files directly.
zoom.us - Secure Video and Web conferencing add-ons available. The free plan is limited to 40 minutes.
Zulip - Real-time chat with a unique email-like threading model. The free plan includes 10,000 messages of search history and File storage up to 5 GB. also, it provides a self-hostable open-source version.

CMS

Contentful - Headless CMS. Content management and delivery APIs in the cloud. Comes with one free Community space that includes five users, 25K records, 48 Content Types, 2 locales.
Cosmic - Headless CMS and API toolkit. Free personal plans for developers.
Crystallize - Headless PIM with ecommerce support. Built-in GraphQL API. The free version includes unlimited users, 1000 catalog items, 5 GB/month bandwidth, and 25k/month API calls.
DatoCMS - Offers free tier for small projects. DatoCMS is a GraphQL-based CMS. On the lower tier, you have 100k/month calls.
Hygraph - Offers free tier for small projects. GraphQL first API. Move away from legacy solutions to the GraphQL native Headless CMS - and deliver omnichannel content API first.
Prismic - Headless CMS. Content management interface with fully hosted and scalable API. The Community Plan provides unlimited API calls, documents, custom types, assets, and locales to one user. Everything that you need for your next project. Bigger free plans are available for Open Content/Open Source projects.
Sanity.io - Platform for structured content with an open-source editing environment and a real-time hosted data store. Unlimited projects. Unlimited admin users, three non-admin users, two datasets, 500K API CDN requests, 10GB bandwidth, and 5GB assets included for free per project.
Solo - Free AI website creator from Mozilla, create a beautiful website for your business from a few simple inputs. Free custom domain, no credit card needed.
Squidex - Offers free tier for small projects. API / GraphQL first. Open source and based on event sourcing (versing every change automatically).
Storyblok - A Headless CMS for developers and marketers that works with all modern frameworks. The Community (free) tier offers Management API, Visual Editor, ten sources, Custom Field Types, Internationalization (unlimited languages/locales), Asset Manager (up to 2500 assets), Image Optimizing Service, Search Query, Webhook + 250GB Traffic/month included.
TinaCMS - Replacing Forestry.io. Open source Git-backed headless CMS that supports Markdown, MDX, and JSON. The basic offer is free with two users available.
WPJack - Set up WordPress on any cloud in less than 5 minutes! The free tier includes 1 server, 2 sites, free SSL certificates, and unlimited cron jobs. No time limits or expirations-your website, your way.

Management System

bitnami.com - Deploy prepared apps on IaaS. Management of 1 AWS micro instance free
Esper - MDM and MAM for Android Devices with DevOps. One hundred devices free with one user license and 25 MB Application Storage.
jamf.com - Device management for iPads, iPhones, and Macs, three devices free
Miradore - Device Management service. Stay up-to-date with your device fleet and secure unlimited devices for free. The free plan offers basic features.
moss.sh - Help developers deploy and manage their web apps and servers. Free up to 25 git deployments per month
ploi.io - Server management tool to easily manage and deploy your servers & sites. Free for one server.
runcloud.io - Server management focusing mainly on PHP projects. Free for up to 1 server.
serveravatar.com - Manage and monitor PHP-based web servers with automated configurations. Free for one server.
xcloud.host - Server management and deployment platform with a user-friendly interface. Free tier available for one server.

Messaging and Streaming

Ably - Realtime messaging service with presence, persistence and guaranteed delivery. The free plan includes 3m messages per month, 100 peak connections, and 100 peak channels.
cloudamqp.com - RabbitMQ as a Service. Little Lemur plan: max 1 million messages/month, max 20 concurrent connections, max 100 queues, max 10,000 queued messages, multiple nodes in different AZ's
courier.com - Single API for push, in-app, email, chat, SMS, and other messaging channels with template management and other features. The free plan includes 10,000 messages/mo.
EMQX Serverless - Scalable and secure serverless MQTT broker you can get in seconds. 1M session minutes/month free forever (no credit card required).
Engage - All-in-one Customer Engagement and Automation Tool (email, push, SMS, product tours, banners and more) for SaaS. Free for up to 1,000 active users per month.
engagespot.co - Multi-channel notification infrastructure for developers with a prebuilt in-app inbox and no-code template editor. Free plan includes 10,000 messages/mo.
HiveMQ - Connect your MQTT devices to the Cloud Native IoT Messaging Broker. Free to connect up to 100 devices (no credit card required) forever.
httpSMS - Send and receive text messages using your Android phone as an SMS Gateway. Free to send and receive up to 200 messages per month.
knock.app - Notifications infrastructure for developers. Send to multiple channels like in-app, email, SMS, Slack, and push with a single API call. The free plan includes 10,000 messages/mo.
Novu.co - The open-source notification infrastructure for developers. Simple components and APIs for managing all communication channels in one place: Email, SMS, Direct, In-App and Push. The free plan includes 30,000 notifications/month with 90 days of retention.
Pingram.io - Communication infrastructure in 5 minutes. Free tier includes: 100 SMS and calls, 3000 Emails, Push, Slack, MS Teams, WhatsApp, and more.
Pocket Alert - Send push notifications to your iOS and Android devices. Effortlessly integrate via API or Webhooks and maintain full control over your alerts. Free plan: 50 messages per day to 1 device and 1 application.
pubnub.com - Swift, Kotlin, and React messaging at 1 million transactions each month. Transactions may contain multiple messages.
pusher.com - Realtime messaging service. Free for up to 100 simultaneous connections and 200,000 messages/day
scaledrone.com - Realtime messaging service. Free for up to 20 simultaneous connections and 100,000 events/day
SMSGate - SMS Gateway for Android™ enables sending and receiving SMS messages through your devices using cloud routing. Completely free cloud service (with recommended notification for usage above 10,000 messages/day to maintain quality for all users).
SuprSend - SuprSend is a notification infrastructure that streamlines your product notifications with an API-first approach. Create and deliver transactional, crons, and engagement notifications on multiple channels with a single notification API. In free plan you get 10,000 notifications per month, including different workflow nodes such as digests, batches, multi-channels, preferences, tenants, broadcasts and more.
synadia.com - [NATS.io](https://nats.io) as a service. Global, AWS, GCP, and Azure. Free forever with 4k msg size, 50 active connections, and 5GB of data per month.
vask - Realtime messaging service, Pusher-compatible. Dev tier is limited to local development only and free with 100 concurrent connections, 1,000,000 broadcasts/month, unlimited client events, 32kb message size.
webpushr - Web Push Notifications - Free for upto 10k subscribers, unlimited push notifications, in-browser messaging

Translation Management

AutoLocalise.com - Instantly localize without managing translation files. Free for up to 10,000 characters/month, unlimited languages.
crowdin.com - Unlimited projects, unlimited strings, and collaborators for Open Source
Free PO editor - Free for everybody
Lingo.dev - Open-source AI-powered CLI for web & mobile localization. Bring your own LLM, or use 10,000 free words every month via Lingo.dev-managed localization engine.
lingohub.com - Free up to 3 users, always free for Open Source
localazy.com - Free for 1000 source language strings, unlimited languages, unlimited contributors, startup and open source deals
Localhero.ai - Automatic on-brand translations on every pull request, with glossary and translation memory. Free for 1 project, 250 translation credits/month (~4,000 words).
Localit - Fast, developer-friendly localization platform with seamless and free GitHub/GitLab integration, AI-assisted and manual translations, and a generous free plan (includes 2 users, 500 keys, and unlimited projects).
localizely.com - Free for Open Source
Loco - Free up to 2000 translations, Unlimited translators, ten languages/project, 1000 translatable assets/project
POEditor - Free up to 1000 strings
SimpleLocalize - Free up to 100 translation keys, unlimited strings, unlimited languages, startup deals
Texterify - Free for a single user
Tolgee - Free SaaS offering with limited translations, forever-free self-hosted version
transifex.com - Free for Open Source

Email

10minutemail - Free, temporary email for testing.
AhaSend - Transactional email service, free for 1000 emails per month, with unlimited domains, team members, webhooks and message routes in the free plan.
anon.li Alias - Open source, anonymous email alias/forwarding solution with PGP encryption, reply capability, 10 random & 1 custom alias on the free plan with developer API & CLI.
AnonAddy - Open-source anonymous email forwarding, create unlimited email aliases for free
Antideo - 10 API requests per hour for email verification, IP, and phone number validation in the free tier. No Credit Cards are required.
Brevo - 9,000 emails/month, 300 emails/day free
Bump - Free 10 Bump email addresses, one custom domain
Burnermail - Free 5 Burner Email Addresses, 1 Mailbox, 7-day Mailbox History
Buttondown - Newsletter service. Up to 100 subscribers free
Conduit - Turn incoming emails into webhooks to trigger your API from emails. The service is completely free.
Contact.do - Contact form in a link (bitly for contact forms)
debugmail.io - Easy to use testing mail server for developers
dkimvalidator.com - Test if the email's DNS/SPF/DKIM/DMARC settings are correct, free service by roundsphere.com
DNSExit - Up to 2 Email addresses under your domain for free with 100MB of storage space. IMAP, POP3, SMTP, SPF/DKIM support.
EmailGuard - Block disposable emails, catch typos, and validate MX records via a simple API. 100 free requests/month.
EmailJS - This is not an entire email server; this is just an email client that you can use to send emails right from the client without exposing your credentials, the free tier has 200 monthly requests, 2 email templates, Requests up to 50Kb, Limited contacts history.
EmailLabs.io - Send up to 9,000 Emails for free every month, up to 300 emails daily.
EmailOctopus - Up to 2,500 subscribers and 10,000 emails per month free
EmailQo Email Infrastructure Grader - Free email infrastructure grader that checks SPF, DKIM, DMARC and mail server configuration. Scores any domain out of 100. No signup required.
Emailvalidation.io - 100 free email verifications per month
Emitlo - free 12,000 emails/month, Email API and SMTP, SPF/DKIM/DMARC support, No Credit Cards are required.
EtherealMail - Ethereal is a fake SMTP service, mainly aimed at Nodemailer and EmailEngine users (but not limited to). It's an entirely free anti-transactional email service where messages never get delivered.
forwardemail.net - Free email forwarding for custom domains. Create and forward an unlimited amount of email addresses with your domain name (**note**: You must pay if you use .casa, .cf, .click, .email, .fit, .ga, .gdn, .gq, .lat, .loan, .london, .men, .ml, .pl, .rest, .ru, .tk, .top, .work TLDs due to spam)
Imitate Email - Sandbox Email Server for testing email functionality across build/qa and ci/cd. Free accounts get 15 emails a day forever.
ImprovMX - Free email forwarding.
Inboxes App - Create up to 3 temporary emails a day, then delete them when you're done from within a handy Chrome extension. Perfect for testing signup flows.
inboxkitten.com - Free temporary/disposable email inbox, with up to 3-day email auto-deletes. Open source and can be self-hosted.
KaiMail - Email forwarding for custom domains with ARC/DKIM signing. Free plan includes 1 domain, 1 mailbox, 300 emails/month, and up to 1MB message size. Email receiving webhook also available. Special plans for open-source projects.
mail-tester.com - Test if the email's DNS/SPF/DKIM/DMARC settings are correct, 20 free/month.
mailcatcher.me - Catches mail and serves it through a web interface.
mailchannels.com - Email API with REST API and SMTP integrations, free for upto 3,000 emails/month.
Mailcheck.ai - Prevent users to sign up with temporary email addresses, 120 requests/hour (~86,400 per month)
Maildroppa - Up to 100 subscribers and unlimited emails as well as automations for free.
MailerLite.com - 1,000 subscribers/month, 12,000 emails/month free
Maileroo - SMTP relay and email API for developers. 5,000 emails per month, unlimited domains, free email verification, blacklist monitoring, mail tester and more.
MailerSend.com - Email API, SMTP, 3,000 emails/month free for transactional emails
mailinator.com - Free, public email system where you can use any inbox you want
Mailjet - 6,000 emails/month free (200 emails daily sending limit)
mailsac.com - Free API for temporary email testing, free public email hosting, outbound capture, email-to-slack/websocket/webhook (1,500 monthly API limit)
Mailtrap.io - Email API, SMTP, 3,500 emails/month free for transactional and marketing emails. Email Sandbox - fake SMTP server for development, free plan with one inbox, 100 messages, no team member, two emails/second, no forward rules.
Mutant Mail - Free 10 Email IDs, 1 Domain, 1 Mailbox. Single Mailbox for All Email IDs.
OneSignal - 10,000 emails/month,No Credit Cards are required.
Orbisearch - Free bulk email validator, 100 validations per day, no signup required.
Parsio.io - Free email parser (Forward email, extract the data, send it to your server)
Plunk - 3K emails/month for free
Postmark - 100 emails/month free, unlimited DMARC weekly digests.
Proton Mail - Free secure email account service provider with built-in end-to-end encryption. Free 1GB storage.
Resend - Transactional emails API for developers. 3,000 emails/month, 100 emails/day free, one custom domain.
SendBridge Mail Tester - Free email deliverability test with no signup. Generates a unique inbox address, then analyzes SPF, DKIM, DMARC, Rspamd spam score, 23+ RBL blacklists, reverse DNS, and content quality. Unlimited tests, results in seconds, shareable report pages.
Sender - Up to 15,000 emails/month, up to 2,500 subscribers
Sendpulse - 500 subscribers/month, 15,000 emails/month free
SendStreak - Email framework as a service, that adds templates, automations, history, etc to your own SMTP server (E.g. AWS, Maileroo, Gmail). Free up to 100 emails/day, no time limit.
SimpleLogin - Open source, self-hostable email alias/forwarding solution. Free 10 Aliases, unlimited bandwidth, unlimited reply/send. Free for educational staff (student, researcher, etc.).
Substack - Unlimited free newsletter service. Start paying when you charge for it.
Sweego - European transactional emails API for developers. 100 emails/day free.
temp-mail.io - Free disposable temporary email service with multiple emails at once and forwarding
Temp-Mail.org - Temporary / Disposable Mail Gen Utilizing a range variety of domain. Email Address refreshes everytime, the page is reloaded. It is entirely free and does not include any pricing for their services.
TempMailDetector.com - Verify up to 200 emails a month for free and see if an email is temporary or not.
trashmail.com - Free disposable email addresses with forwarding and automatic address expiration
Tuta - Free secure email account service provider with built-in end-to-end encryption, no ads, no tracking. Free 1GB storage, one calendar (Tuta also have an [paid plan](https://tuta.com/pricing).). Tuta is also partially [open source](https://github.com/tutao/tutanota), so you can self-host.
Verifalia - Real-time email verification API with mailbox confirmation and disposable email address detector; 25 free email verifications/day.
verimail.io - Bulk and API email verification service. 100 free verifications/month
Waitlio - Waitlist management software for product launches. Create branded waitlist pages, collect and verify email subscribers, manage signups with tags and analytics. Free plan includes 100 subscribers/month, 1 waitlist, and API access.
Wraps - email automation workflows, 5k tracked events and unlimited contacts free.

Feature Toggles Management Platforms

Abby - Open-Source feature flags & A/B testing. Configuration as Code & Fully Typed Typescript SDKs. Strong integration with Frameworks such as Next.js & React. Generous free tier and cheap scaling options.
ConfigCat - ConfigCat is a developer-centric feature flag service with unlimited team size, excellent support, and a reasonable price tag. Free plan up to 10 flags, two environments, 1 product, and 5 Million requests per month.
Flagsmith - Release features with confidence; manage feature flags across web, mobile, and server-side applications. Use our hosted API, deploy to your own private cloud, or run on-premise.
GrowthBook - Open source feature flag and A/B testing provider with built-in Bayesian statistical analysis engine. Free for up to 3 users, unlimited feature flags and experiments.
Hypertune - Type-safe feature flags, A/B testing, analytics and app configuration, with Git-style version control and synchronous, in-memory, local flag evaluation. Free for up to 5 team members with unlimited feature flags and A/B tests.
Rollgate - Feature flag management with scheduled releases, instant rollback, and A/B testing. 13 SDKs included. Free plan up to 500K API requests/month, unlimited flags, 3 team members, no credit card required.
Statsig - A robust platform for feature management, A/B testing, analytics, and more. Its generous free plan offers unlimited seats, flags, experiments, and dynamic configurations, supporting up to 1 million events per month.
Toggled.dev - Enterprise-ready, scalable multi-regional feature toggles management platform. Free plan up to 10 flags, two environments, unlimited requests. SDK, analytics dashboard, release calendar, Slack notifications, and all other features are included in the endless free plan.

Issue Tracking and Project Management

acunote.com - Free project management and SCRUM software for up to 5 team members
asana.com - Free for private project with collaborators
Backlog - Everything your team needs to release great projects in one platform. The free plan offers 1 Project with ten users & 100MB of storage.
Basecamp - To-do lists, milestone management, forum-like messaging, file sharing, and time tracking. Up to 3 projects, 20 users, and 1GB of storage space.
bitrix24.com - Intranet and project management tool. The free plan has 5GB for unlimited users.
cacoo.com - Online real-time diagrams: flowchart, UML, network. Free max. 15 users/diagram, 25 sheets
clickup.com - Project management. Free, premium version with cloud storage. Mobile applications and Git integrations are available.
Clockify - Time tracker and timesheet app that lets you track work hours across projects. Unlimited users, free forever.
Cloudcraft - Design a professional architecture diagram in minutes with the Cloudcraft visual designer, optimized for AWS with intelligent components that show live data too. Free plan has unlimited private diagrams for single user.
Confluence - Atlassian's content collaboration tool is used to help teams collaborate and share knowledge efficiently. Free plan for up to 10 users.
Crosswork - Versatile project management platform. Free for up to 3 projects, unlimited users, 1 GB storage.
diagrams.net - Online diagrams stored locally in Google Drive, OneDrive, or Dropbox. Free for all features and storage levels
easyretro.io - Simple and intuitive sprint retrospective tool. The free plan has three public boards and one survey per board per month.
freedcamp.com - tasks, discussions, milestones, time tracking, calendar, files and password manager. Free plan with unlimited projects, users, and file storage.
GForge - Project Management and issue Tracking toolset for complex projects with self-premises and SaaS options. SaaS free plan offers the first five users free & free for Open Source Projects.
gleek.io - Free description-to-diagrams tool for developers. Create informal UML class, object, or entity-relationship diagrams using your keyword.
GraphQL Inspector - GraphQL Inspector outputs a list of changes between two GraphQL schemas. Every difference is precisely explained and marked as breaking, non-breaking, or dangerous.
Helploom - Customer support software that offers a live chat on the free forever plan. Simple, lightweight and beautiful. Setup is a simple copy-paste script. Built by a developer.
Hygger - Project management platform. The free plan offers unlimited users, projects & boards with 100 MB of Storage.
Ilograph - interactive diagrams that allow users to see their infrastructure from multiple perspectives and levels of detail. Charts can be expressed in code. The free tier has unlimited private diagrams with up to 3 viewers.
Jira - Advanced software development project management tool used in many corporate environments. Free plan for up to 10 users.
kan.bn - A powerful, flexible kanban app that helps you organise work, track progress, and deliver results-all in one place. Free plan up to 1 user for unlimited boards, unlimited lists, unlimited cards.
kanbanflow.com - Board-based project management. Free, premium version with more options
kanbantool.com - Kanban board-based project management. The free plan has two boards and two users, without attachments or files.
Kitemaker.co - Collaborate through all phases of the product development process and keep track of work across Slack, Discord, Figma, and Github. Unlimited users, unlimited spaces. Free plan up to 250 work items.
Kiter.app - Let anyone organize their job search and track interviews, opportunities, and connections. Powerful web app and Chrome extension. Completely free.
Kumu.io - Relationship maps with animation, decorations, filters, clustering, spreadsheet imports, etc. The free tier allows unlimited public projects. Graph size unlimited. Free private projects for students. Sandbox mode is available if you prefer not to leave your file publicly online (upload, edit, download, discard).
leiga.com - Leiga is a SaaS product that uses AI to automatically manage your projects, helping your team stay focused and unleash immense potential, ensuring your projects progress as planned. Free for up to 10 users, 20 custom fields, 2GB of storage space, Video Recording with AI limited to 5 mins/video, Automation Runs at 20/user/month.
Linear - Issue tracker with a streamlined interface. Free for unlimited members, up to 10MB file upload size, 250 issues (excluding Archive)
Lucidchart - An online diagram tool with collaboration features. Free plan with three editable documents, 100 professional templates, and basic collaboration features.
MeisterTask - Online task management for teams. Free up to 3 projects and unlimited project members.
MeuScrum - Free online scrum tool with kanban board
nTask - Project management software that enables your teams to collaborate, plan, analyze, and manage everyday tasks. The essential plan is free forever with 100 MB storage and five users/teams. Unlimited workspaces, meetings, assignments, timesheets, and issue tracking.
Plane - Plane is a simple, extensible, open-source project and product management tool. Free for unlimited members, up to 5MB file upload size, 1000 issues.
planitpoker.com - Free online planning poker (estimation tool)
point.poker - Online Planning Poker (consensus-based estimation tool). Free for unlimited users, teams, sessions, rounds, and votes. You don't need to register.
Pulse.red - Free Minimalistic Time Tracker and Timesheet app for projects.
ScrumFast - Scrum board with a very intuitive interface, free up to 5 users.
Sflow - sflow.io is a project management tool built for agile software development, marketing, sales, and customer support, especially for outsourcing and cross-organization collaboration projects. Free plan up to 3 projects and five members.
Shake - In-app bug reporting and feedback tool for mobile apps. Free plan, ten bug reports per app/month.
Shortcut - Project management platform. Free for up to 10 users forever.
taiga.io - Project management platform for startups and agile developers, free for Open Source
taskade.com - Real-time collaborative task lists and team outlines. The free plan has one workspace with unlimited tasks and projects; 1GB file storage; 1-week project history; and five attendees per video meeting.
Teaminal - Standup, retro, and sprint planning tool for remote teams. Free for up to 15 users.
teamwork.com - Project management & Team Chat. Free for five users and two projects. Premium plans are available.
teleretro.com - Simple and fun retrospective tool with icebreakers, gifs and emojis. The free plan includes three retros and unlimited members.
Tenzu - Lightweight project management tool for agile teams. The SaaS relies on free contributions; users can always choose to give 0 and there is no features paywall {[more details](https://tenzu.net/pricing/)}
titanapps.io - productivity tools for Jira and monday.com offering structured checklists, templates, and approvals inside issues/tasks. Free plan available for small teams.
todoist.com - Collaborative and individual task management. The free plan has: 5 active projects, five users in the project, file uploading up to 5MB, three filters, and one week of activity history.
Toggl - Provides two free productivity tools. [Toggl Track](https://toggl.com/track/) for time management and tracking app with a free plan provides seamless time tracking and reporting designed with freelancers in mind. It has unlimited tracking records, projects, clients, tags, reporting, and more. And [Toggl Plan](https://toggl.com/plan/) for task planning with a free plan for solo developers with unlimited tasks, milestones, and timelines.
trello.com - Board-based project management. Unlimited Personal Boards, 10 Team Boards.
Tweek - Simple Weekly To-Do Calendar & Task Management.
Wikifactory - Product designing Service with Projects, VCS & Issues. The free plan offers unlimited projects & collaborators and 3GB storage.
Yodiz - Agile development and issue tracking. Free up to 3 users, unlimited projects.
YouTrack - Free hosted YouTrack (InCloud) for FOSS projects and private projects (free for three users). Includes time tracking and agile boards
zenhub.com - The only project management solution inside GitHub. Free for public repos, OSS, and nonprofit organizations
zenkit.com - Project management and collaboration tool. Free for up to 5 members, 5 GB attachments.
Zube - Project management with free plan for 4 Projects & 4 users. GitHub integration is available.

Dev Blogging Sites

AyeDot - Share your ideas, knowledge, and stories with the world for Free in the form of Modern multimedia short-format Miniblogs.
BearBlog - Minimalist, Markdown-powered blog and website builder.
Dev.to - Where programmers share ideas and help each other grow.
Hashnode - Hassle-free Blogging Software for Developers!.
JustBlogged - Free blogging platform with custom domain support, and fast global performance.
Medium - Get more thoughtful about what matters to you.

Commenting Platforms

GraphComment - GraphComment is a comments platform that helps you build an active community from the website’s audience.
IntenseDebate - A feature-rich comment system for WordPress, Tumblr, Blogger, and many other website platforms.
Remarkbox - Open source hosted comments platform, pay what you can for "One moderator on a few domains with complete control over behavior & appearance"
Utterances - A lightweight comments widget built on GitHub issues. Use GitHub issues for blog comments, wiki pages, and more!