Free tools, services, and credits offered to open-source projects and their maintainers.
- AI & Machine Learning
- Analytics
- CI/CD
- Communication
- Credentials & Secrets
- Developer Tools
- Funding
- Hosting & Deployment
- Infrastructure
- Monitoring & Observability
- Security
- Support
- Testing
- Anthropic - Anthropic provides 6 months of free Claude Max 20x to open-source maintainers and contributors as a thank-you for keeping the ecosystem running.
- CodeRabbit - CodeRabbit provides free AI-driven code reviews for public repositories on GitHub and GitLab, backed by a $1 million commitment to open-source sponsorships.
- GitHub - GitHub provides free Copilot Pro access to maintainers of popular open-source repositories, enabling AI-assisted coding at no cost.
- Greptile - Free AI code review for open source projects. Non-commercial projects with MIT, Apache, or GPL licenses get full access to Greptile's GitHub PR review bot at no cost.
- OpenAI - OpenAI offers 6 months of free ChatGPT Pro with Codex access, API credits, and conditional Codex Security access for open-source maintainers.
- OpenAI - A $1 million grant initiative providing one-time API credit grants of up to $25,000 for open source projects integrating Codex CLI or OpenAI models — separate from the Codex for Open Source subscription benefit.
- Sourcery - Free AI-powered code reviews for open source projects on public repositories, with full Pro-tier functionality including IDE integration and security scans.
- OpenPanel - OpenPanel offers free analytics for open-source projects with up to 2.5 million events per month, full feature access, and unlimited team members.
- PostHog - Free credits for small open-source projects covering product analytics, session replay, feature flags, error tracking, and more.
- Blacksmith - Free high-performance GitHub Actions runners for open source projects. Blacksmith provides 2x faster hardware and 4x faster cache downloads, currently supporting projects like Celery, Ladybird, Zen, and Limbo.
- CircleCI - CircleCI provides generous free build credits for open-source projects on the Free Plan, covering Linux, Arm, Docker, macOS, and Windows builds.
- Semaphore - Free unlimited CI/CD minutes for open source projects with four parallel Linux machines and one macOS machine, plus build badges and secret management.
- Zulip - Zulip Cloud Standard is free for open-source projects, providing organized team chat with topics, full message history, and powerful integrations.
- 1Password - 1Password provides a free Teams account to open-source projects, enabling secure storage and sharing of credentials, API tokens, SSH keys, and secrets.
- Algolia - Free or discounted Algolia plans for qualifying open-source and non-profit projects, including 200,000 records and 200,000 search requests per month.
- Atlassian - Free Atlassian Standard cloud products including Rovo, Jira, Confluence, Trello, Bitbucket, and more for qualifying open-source projects.
- Cal.com - Cal.com sponsors open source projects with free access to their scheduling platform. Projects must display a 'Book us with Cal.com' banner in their README and website footer.
- Crowdin - Free localization platform for open source projects with an OSI-approved license, including translation memory, glossaries, 700+ integrations, and GitHub/GitLab/Bitbucket sync.
- cubic - The leading AI code review platform – used by teams like Resend, n8n, Better Auth, and thousands of other open source teams.
- GitBook - Free Community plan for open source projects with access to all Ultimate features (except SAML SSO), GitHub/GitLab sync, unlimited contributors, and no hosting fees.
- GitLab - GitLab provides free Ultimate-tier features and 50,000 compute minutes for qualifying open-source projects through the GitLab for Open Source Program.
- JetBrains - JetBrains offers free All Products Pack subscriptions for open-source project core teams, covering all JetBrains IDEs for development.
- Mintlify - Non-commercial open source projects get Mintlify's Pro plan for free (normally $300/month), including custom domains, advanced analytics, API playground, AI chat, and version control.
- Sanity - Sanity offers its Growth plan for free to non-monetized open source projects, including 3 datasets, 25 users, SAML SSO, and no credit card required as long as you stay within quotas.
- Stainless - Free Starter plan (normally $79/mo per generator) for qualifying non-commercial open-source projects, including SDK, documentation site, and MCP server generation from OpenAPI specs.
- Microsoft - The Microsoft FOSS Fund provides a direct way for Microsoft engineers to participate in the nomination and selection process to sponsor open source projects they are passionate about.
- Netlify - Netlify offers a dedicated Open Source plan with generous credits, unlimited team members, and free production deploys for qualifying projects.
- Vercel - Vercel provides platform credits, community support, and an OSS Starter Pack with third-party credits to power open-source projects.
- Cloudflare - Project Alexandria provides recurring annual credits for open-source projects, including Zero Trust access, R2 storage, Workers, Pages, and plan upgrades.
- Convex - Convex sponsors open-source developers building tools, frameworks, and apps that strengthen the ecosystem with free Pro credits, swag, and direct community support.
- DigitalOcean - Annual credit grants for open source projects tiered by GitHub stars, from $60/year (100+ stars) to $20,000/year (10,000+ stars), plus swag, co-marketing, and direct access to the open source team.
- Docker - The Docker-Sponsored Open Source (DSOS) Program provides verified badges, repository logo customization, insights and analytics, Docker Scout access, and removal of rate limiting for open-source projects.
- Neon - Up to $5,000 in annual Neon credits for open source projects that use Postgres, plus cash payouts through GitHub Sponsorships and promotional support to Neon's 1M+ developer community.
- Upstash - Upstash supports open-source projects with monthly credit grants, direct technical support, and co-marketing opportunities.
- Datadog - Free Datadog accounts for open source projects providing cloud observability and security monitoring. Used by the Apache Software Foundation, Python Software Foundation, ElectronJS, Ruby, and Linux Mint.
- Sentry - Sentry provides free error tracking and performance monitoring for open-source projects with generous usage limits and no term limit.
- Codacy - Free Team plan forever for open source projects, with full cloud platform access including PR integration, quality gates, and security scanning across 49 supported languages.
- Code Climate - Free forever for all open source projects. Code Climate (now Qlty) provides code coverage, maintainability analysis, linting, and auto-formatting with unlimited contributors.
- DeepSource - Free static analysis, SAST, code coverage, and automated code reviews for open source projects with unlimited public repositories and unlimited team members.
- SignPath - Open-source projects can apply for a free code signing certificate through the SignPath Foundation, with secure signing, pipeline integrity, and full audit trails at no cost.
- Snyk - Snyk provides full Enterprise License access with unlimited usage for open-source projects, covering vulnerability scanning, dependency analysis, and security advisories.
- Socket - The Socket for Open Source program offers a free Team plan to open source maintainers to protect their projects from supply chain attacks.
- SonarSource - Free static analysis for open-source projects on SonarQube Cloud, with unlimited members, feature branch analysis, and custom quality standards.
- Cossistant - Free Cossistant Pro plan for open source projects, including credits, a dofollow listing, guest blog posts, and integration support.
- Argos - Free visual regression testing for open source projects. Argos sponsors qualifying OSS projects with full access to their visual testing platform in exchange for a README badge.
- BrowserStack - BrowserStack provides lifetime access to its full testing platform for open-source projects, including cross-browser, real device, and visual testing.
- Chromatic - Free visual testing plan for qualifying open source projects, built by the Storybook team. Includes 35,000 Chrome snapshots per month with cross-browser testing across Chrome, Firefox, Safari, and Edge.
- Codecov - Free forever code coverage for open source projects with unlimited public repositories, PR comments, status checks, and API access. Trusted by over 60,000 OSS projects.
- Coveralls - Free forever code coverage tracking for open source projects with support for C/C++, Go, Java, JavaScript, Python, Ruby, PHP, .NET, and more.
Contributions welcome! Read the contribution guidelines first.
