Best AI Skill Libraries 2026
The skill & competency frameworks — ranked by GitHub stars, features, and community adoption. Each entry links to a full in-depth review.
1. MarkItDown
⭐ 176k+
Microsoft utility to convert files and documents to Markdown…
2. Transformers
⭐ 164k+
State-of-the-art ML models for NLP, vision and audio…
3. LangChain
⭐ 145k+
Framework for building LLM-powered applications…
4. vLLM
⭐ 90k+
High-throughput LLM serving with PagedAttention…
5. Unsloth
⭐ 75k+
2-5x faster LLM fine-tuning with 70% less memory…
6. LLaMA-Factory
⭐ 74k+
Unified fine-tuning framework for 100+ LLMs with WebUI…
7. Docling
⭐ 66k+
IBM's document parsing and understanding library…
8. Mem0
⭐ 64k+
Memory layer for AI agents and assistants…
9. LiteLLM
⭐ 57k+
Unified API for 100+ LLMs with OpenAI format…
10. Segment Anything
⭐ 55k+
Meta's promptable image segmentation foundation model…
How we rank
Tools are ranked by GitHub stars, active maintenance, license openness, and community adoption as of Sep 3, 2026. Every tool is open source and self-hostable.