Not all repos are equal for beginners. Some have great mentorship and clear issues. Others ignore new contributors for weeks. Here are 10 repos that actively welcome first-timers in 2026.
How I Picked These
Each repo meets ALL of these criteria:
- Active (commits in last 30 days)
- Has 10+ open “good first issue” labels right now
- Maintainers respond to PRs within 1 week
- Has CONTRIBUTING.md with clear setup instructions
- Uses a language/framework most developers know
JavaScript / TypeScript
1. freeCodeCamp/freeCodeCamp
Stars: 400K+ | Language: JavaScript/TypeScript
The world’s largest learn-to-code platform. Huge community, very welcoming to beginners. Issues range from fixing curriculum content to frontend features.
2. vercel/next.js
Stars: 130K+ | Language: TypeScript
The most popular React framework. Great docs, clear contributing guide. Focus on docs improvements and bug fixes for your first PR.
3. microsoft/vscode
Stars: 170K+ | Language: TypeScript
The most used code editor. Has a dedicated “good first issue” label with detailed guidance on each issue.
Python
4. python/cpython
Stars: 65K+ | Language: Python/C
Python itself. Has a dedicated mentorship program for new contributors. Start with documentation or test improvements.
5. scikit-learn/scikit-learn
Stars: 60K+ | Language: Python
The most popular ML library. Welcoming community, great for data science enthusiasts. Fix docs, add examples, or improve test coverage.
6. fastapi/fastapi
Stars: 80K+ | Language: Python
Modern Python web framework. Active, growing fast, and the creator personally reviews PRs from newcomers.
Rust / Go / Other
7. denoland/deno
Stars: 95K+ | Language: Rust/TypeScript
The modern JavaScript runtime. Great for learning Rust through real-world systems programming.
8. kubernetes/kubernetes
Stars: 110K+ | Language: Go
The container orchestration standard. Massive project but has dedicated “good first issue” triaging. Start with docs or CLI improvements.
AI / ML Projects
9. langchain-ai/langchain
Stars: 95K+ | Language: Python
THE AI agent framework. Actively seeking contributors for new integrations, documentation, and examples. Perfect timing – AI is hot.
10. modelcontextprotocol/servers
Stars: 87K+ | Language: TypeScript
MCP reference servers by Anthropic. Build new MCP servers, fix existing ones, improve docs. The ecosystem is growing fast and maintainers are responsive.
Pro Tips for Getting Your PR Accepted
- Start with documentation PRs – lowest barrier, maintainers love it
- Read existing PRs first – understand the style and process
- Be responsive to feedback – maintainers lose interest if you don’t reply
- Run tests locally before submitting – failing CI = instant rejection
- Keep it small – a 10-line fix gets reviewed in hours, a 500-line change takes weeks
Contributing to open source makes you a better developer AND looks great on your resume. Join hackathons to practice building