codecrafters-io / build-your-own-x
Master programming by recreating your favorite technologies from scratch.
See what the GitHub community is most excited about today.
Master programming by recreating your favorite technologies from scratch.
🦔 PostHog is the leading platform for building self-driving products. Our developer tools – AI observability, analytics, session replay, flags, experiments, error tracking, logs, and more – capture all the context agents need to diagnose problems, uncover opportunities, and ship fixes. Steer it all from Slack, web, desktop, or the MCP.
Become a cracked AI/ML Research Engineer
Anti-AI-slop design skill for Claude Code, Cursor, and Codex.
Multi-platform SDK for integrating GitHub Copilot Agent into apps and services
Bonsai Demo
Protocol Buffers - Google's data interchange format
Local-first code intelligence graph for MCP and CLI. Builds a persistent map of your codebase so AI coding tools read only what matters, with benchmarked context reductions on reviews and large-repo workflows.
Open source DocuSign alternative. Create, fill, and sign digital documents ✍️
A coding agent for open models like Kimi K3
A vector index built on TurboQuant, written in Rust with Python bindings
DeepTutor: Lifelong Personalized Tutoring. https://deeptutor.info/.
The open-source CapCut alternative