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Curated open-source AI projects with verified GitHub data and hands-on breakdowns.

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ai-agent-book: Open-Source Systematic AI Agent Learning (10 Chapters, 95 Experiments, 13 Languages, 33K Stars)

bojieli/ai-agent-book (33,213 stars, Python, Apache-2.0, created 2025-09-09, pushing today, GitHub Trending) is the open-source repo for the in-depth AI Agent book by Li Bojie: Design Principles and Engineering Practice. Agent = LLM + context + tools; 10 chapters from principles to engineering plus 95 hands-on experiments (local + external repro) plus 13 languages; PDF/EPUB free. The top pick for developers who want to learn AI Agent systematically; the moat is systematic depth plus experiments plus multilingual plus open and free.

open-design: Turn Your Coding Agent Into a Design Engine (84K Stars)

nexu-io/open-design (84,003 stars, TypeScript, Apache-2.0, created 2026-04-28, still pushing 8/6) is the open-source Claude Design alternative and the agent-era Figma alternative. A local-first desktop app that open-sources the Claude Design agent-native loop (discover, lock, stream, critique, deliver) into skills plus DESIGN.md plus plugins, letting 25+ coding agents (Claude Code, Codex, Cursor) act as the design engine and produce brand-contracted single-page runnable artifacts (prototypes, decks, HyperFrames, images) exportable to HTML, PDF, PPTX, MP4. Latest v0.18.0 (8/5).

video-shotcraft: Turn Claude Code Into a Cinematic Product Video Studio (3.5K Stars)

video-shotcraft (Vincentwei1021/video-shotcraft, 3.5K GitHub stars, TypeScript, Apache-2.0) is an agent skill that turns Claude Code or Codex into a motion-design studio - point it at your product and it storyboards, animates, and sound-designs a cinematic promo with Remotion. Ships 104 shot recipe cards, 161 motion previews, a validated 36.2s Ink Press template, 2.5D camera moves, beat-synced cuts, and film-grade SFX. Output is reproducible TSX, not black-box generation. Includes a China AtomGit mirror and 3 headless-rendering CI flags.

book-to-skill: Turn Any Technical Book Into an AI Agent Skill (16.2K Stars)

book-to-skill (virgiliojr94/book-to-skill, 16.2K GitHub stars, Python, MIT) distills technical books/PDFs/EPUBs/doc folders into structured agent skills following the open Agent Skills standard - install once, works across GitHub Copilot CLI, Amp, and Claude Code. Generates SKILL.md + per-chapter files + glossary + patterns + cheatsheet, with chapters loaded on-demand so they don't count against your token budget. Ships a benchmark tool measuring 24-51x fewer tokens than dumping the full book into context (tested on 3 real books). Beyond books: internal docs, brand systems, research clusters, specs. Includes a copyright-compliance note.

Open Code Review: Alibaba's Hybrid AI Code Review (18.3K Stars)

alibaba/open-code-review (18,287 stars, 1,230 forks, Go, Apache-2.0, created 2026-05-18, pushed today) is Alibaba's open-source hybrid-architecture AI code review tool: deterministic pipelines + LLM Agent, precise line-level comments, built-in multi-language ruleset (NPE/thread-safety/XSS/SQL injection), OpenAI/Anthropic compatible, originating from two years of large-scale internal validation at Alibaba, with Claude Code/Codex/Cursor integration and CI/CD support.

DeepSeek-Reasonix: A DeepSeek-Native Terminal Coding Agent (28.6K Stars)

esengine/DeepSeek-Reasonix (28,575 stars, 1,836 forks, Go, MIT, created 2026-04-21, pushed today) is a community-built DeepSeek-native terminal coding agent -- not an official DeepSeek product. It is tuned around DeepSeek's prefix cache: cache-hit input costs 0.02 yuan vs 1 yuan for misses, a 50x gap. A single static Go binary, config/plugin-driven (reasonix.toml), supporting dual-model executor+planner, MCP plugins, and cross-compilation to 6 platforms. Includes four install paths and peer comparison.