Best Open Source prompt engineering Libraries
A curated list of the most popular GitHub repositories tagged with prompt engineering. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.
#1f/prompts.chat
f.k.a. Awesome ChatGPT Prompts. Share, discover, and collect prompts from the community. Free and open source β self-host for your organization with complete privacy.
#2microsoft/generative-ai-for-beginners
21 Lessons, Get Started Building with Generative AI
#3dair-ai/Prompt-Engineering-Guide
π Guides, papers, lessons, notebooks and resources for prompt engineering, context engineering, RAG, and AI Agents.
#4headroomlabs-ai/headroom
Compress tool outputs, logs, files, and RAG chunks before they reach the LLM. 20% fewer tokens for coding agents, 60-95% fewer tokens for JSON, same answers. Library, proxy, MCP server.
#5asgeirtj/system_prompts_leaks
Collection of extracted System Prompts from popular chatbots like ChatGPT, Claude & Gemini
#6github/awesome-copilot
Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot.
#7sickn33/antigravity-awesome-skills
The Ultimate Collection of 1000+ Agentic Skills for Claude Code/Antigravity/Cursor. Battle-tested, high-performance skills for AI agents including official skills from Anthropic and Vercel.
#8linshenkx/prompt-optimizer
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#9mlflow/mlflow
The open source AI engineering platform for agents, LLMs, and ML models. MLflow enables teams of all sizes to debug, evaluate, monitor, and optimize production-quality AI applications while controlling costs and managing access to models and data.
#10AI4Finance-Foundation/FinGPT
FinGPT: Open-Source Financial Large Language Models! Revolutionize π₯ We release the trained model on HuggingFace.
#11humanlayer/12-factor-agents
What are the principles we can use to build LLM-powered software that is actually good enough to put in the hands of production customers?
#12comet-ml/opik
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.
#13promptfoo/promptfoo
Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, Llama, and more. Simple declarative configs with command line and CI/CD integration.
#14ZeroLu/awesome-nanobanana-pro
π An awesome list of curated Nano Banana pro prompts and examples. Your go-to resource for mastering prompt engineering and exploring the creative potential of the Nano banana pro(Nano banana 2) AI image model.
#15YouMind-OpenLab/awesome-nano-banana-pro-prompts
π World's largest Nano Banana Pro prompt library β 10,000+ curated prompts with preview images, 16 languages. Google Gemini AI image generation. Free & open source.
#16Arize-ai/phoenix
AI Observability & Evaluation
#17Zipstack/unstract
LLM-Driven Extraction of Unstructured Data β Built for API Deployments & ETL Pipeline Workflows
#18vllm-project/semantic-router
Intelligent Mixture-of-Models Router for Efficient Heterogeneous LLMs Inference
#19FellouAI/eko
Eko (Eko Keeps Operating) - Build Production-ready Agentic Workflow with Natural Language - eko.fellou.ai
#20thenicolas1894/awesome-claude-fable-5-prompt-vault
Ultimate Claude Fable 5 Guide 2026: Use Cases, Integrations & Benchmarks