Formerly started at YCombinator

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BitBucket - free for open source and private repositories

codeberg - free as in freedom for open source repositories - backed by a nonprofit association

GitHub - free for open source repositories, free for private repositories

GitLab - free for open source and private repositories

Heptapod FOSS - free of charge service for open source Mercurial repositories - upon hosting request

NuGet - free .NET Project Hosting

Python Anywhere - hosting for Python projects - has limits

SourceForge - Git/Mercurial/SVN Project Hosting

DigitalOcean - free credits for eligible open source projects - request needed

OpenShift - free for open source - request needed

Heroku - free tier for experimenting, sleeps after 30 minutes of inactivity

Vercel - free tier includes all-in-one Static and JAMstack deployment, Serverless Functions, and Global CDN (formerly ZEIT Now)

GitBook - free for open source - request needed

Read the Docs - automating building, versioning, and hosting of your docs - free for open source

Atlassian Confluence - free for open source - request needed

AppVeyor - Continuous Integration for .NET and many open source languages on Windows

Azure Pipelines - Azure Pipelines offers cloud-hosted pipelines for Linux, macOS, and Windows with unlimited minutes for open source projects.

Atlassian Bamboo - Continuous integration, deployment, and delivery on your own server - free for open source - request needed

Bitrise - Continuous Integration for mobile

CircleCI - Continuous Integration and Delivery - 3 extra containers

Codecov - Continuous Code Coverage

Codeship - Continuous Integration and Delivery for several languages, also supports Docker

Coveralls - Code Coverage History

Deploy - Continuous Deployment - email request needed

DeployBot - continuous deployment for GitHub, BitBucket or your own Git/SVN repository - free for one repository

Gitlab-CI - on-premises CI for GitLab - free and open source

Sauce Labs - CI for GitHub, Google Code, SourceForge with Selenium - free for open source

Scrutinizer - CI for GitHub and BitBucket - free for open source

Semaphore - CI for GitHub and BitBucket - free for open source

Team City - free for open source - strict rules - request needed

Travis CI - CI for GitHub - free for open source

Knapsackpro - Speed up your tests run 1 hour test suite in 2 minutes with optimal parallelisation on your CI - request needed

Browser Stack - Live, Web-Based Browser Testing - request needed

LambdaTest - Live ,Web and Mobile App Browser Testing - request needed-Free For Open Source

TestingBot - Browser Testing - request needed

Bugsnag - Multilanguage Crossplatform Error Monitoring - free for open source - email request needed

Datadog - Real-time performance monitoring for open source projects - free for open source - request needed

Healthchecks.io - Cron monitoring - free for open source - email request needed

Hund - Hosted Status Pages - free for open source - email request needed

Sentry - 100% Open Source Crash Reporting - forever free for open source - request needed

Codacy - Automated Code Review for Scala, JavaScript, PHP, Python and CSS - free for open source

CodeClimate - Code Review for Ruby, JavaScript, PHP - free for open source

LGTM - Continuous security analysis and automated code review - free for open source

QuantifiedCode - Automated Code Review for Python - free for open source

SemanticDiff - Programming language aware diff for GitHub pull requests and commits, supports multiple languages - free for open source

Snyk - Continuously find & fix vulnerabilities in your dependencies, supports multiple languages - free for open source and low volume private testing

SonarCloud - Code coverage, code smell, and bug/vulnerability detection and tracking

Crowdin - free for open source - request needed

Launchpad - Localization Platform for open source projects

Localeum - free for startups and solo developers

Localizely - free for open source - request needed

Lokalise - Localization and Translation Software Tool - request needed

POEditor - free for open source - request needed

Transifex - Localization Platform for Web

Translation.io - Localization for Rails apps - email request needed

Weblate.org - email request needed (weblate itself is open source)

Blackfire - PHP Profiler by creators of Symfony

YourKit - Java Profiler

Helpmonks - Team email management. Simplified. - free for open source projects and non-profit organizations

MailChimp - free for 12,000 emails to 2,000 subscribers

EmailOctopus - free for 10,000 emails to 2,500 subscribers a month

SendGrid - free 100 emails / day

SendinBlue - free 300 emails / day

AppCode - Objective C IDE - free for open source, Outercurve developers - strict rules - request needed

IntelliJ Idea - Java IDE - free for non-Apache developers, Apache developers, Outercurve developers - strict rules - request needed

PhpStorm - PHP IDE - free for open source, Outercurve developers - strict rules - request needed

PyCharm - Python IDE - free for open source, Outercurve developers - strict rules - request needed

RubyMine - Ruby IDE - free for open source, Outercurve developers - strict rules - request needed

Visual Studio Community - free, fully-featured IDE for students, open-source and individual developers

VS Codium - binary releases of Visual Studio Code without MS branding/telemetry/licensing

WebStorm - JavaScript, CSS, HTML IDE - free for open source, Outercurve developers - strict rules - request needed

Acunote - Agile project management tool and scrum software - request needed

Atlassian Jira - Project management and issue tracking - free for open source - request needed

Taiga.io - Agile project management platform - free for public projects

Ducalis - Prioritization, Roadmaps, and User Feedback Tracking Free for Open Source and Non-Profits - request needed

Teamwork - free for 2 Projects, 10MB Storage

Trello - simple bugtracker - free for all

YouTrack - free for open source - strict rules - request needed

Zenhub - Team collaboration in GitHub - free for public and open source projects

Discourse.org - Civilized discussion forum for your team/customers/fans/patrons - request needed

Convas.io - Feedback page for your projects where your users can share, discuss and upvote feedback - request needed

Chatwoot - Customer engagement suite, an open-source alternative to Intercom, Zendesk, Salesforce Service Cloud etc - email request needed

Zulip - Group chat webapp and mobile app - Free hosted instance for open source projects & communities

Slack - Messaging platform including persistent chat rooms (channels) organized by topic, private groups, and direct messaging - request needed, free for 249 members and less, 85% discount after

Cloudflare - free Shared SSL cert for everyone, unmetered DDoS mitigation and Web Application Firewall

GoDaddy - free for one year for open source projects

Let’s Encrypt - free, automated, and open certificate authority

Razuna - World's most popular open source Digital Asset Management. 30 days free trial

Canva - free for all plan

Mixkit - free video footage & animation - attribution not required

Openclipart - Free clipart for all

Unsplash - Photos for free for all purpose - no link back required (although appreciated)

Algolia - Hosted Search engine as a service - free for community and open source use, email request needed

Apiary - Design, prototype, document and test APIs - email request needed

Auth0 - Single Sign On & Token Based Authentication - request needed

Cloudflare - Pro Plan upgrade for open source projects, includes CDN, SSL cert, Web Application Firewalls, image and mobile optimizations, and more.

Kong - Developer Portals - email request needed

Magny - SaaS service that helps implement command palettes (e.g in-app search) - email request needed

Mailtrap - Fake SMTP servers - email request needed

SDKMAN! - Software Development Kit Manager for JVM developers

Fontpair - FontPair is a tool that helps you pair free, open source Google Fonts together - Free for all

js.org - Free .js.org domain names for JavaScript projects, perfect for use with GitHub pages