Open source langchain projects
Every project in the registry tagged langchain, ranked by real GitHub adoption.
The agent engineering platform.
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. Li
LLM gateway for auth, load balancing, and spend tracking
Build resilient agents.
Langchain-Chatchat（原Langchain-ChatGLM）基于 Langchain 与 ChatGLM, Qwen 与 Llama 等语言模型的 RAG 与 Agent 应用 | Langchain-Chatchat (formerly langchain-ChatGLM), local knowle
Open source LLM engineering platform for AI-powered applications
AI assistant that enhances enterprise knowledge management
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready d
Privacy-first knowledge base with any AI model you choose
Build powerful AI agents with cutting-edge LLM technology
LangChain4j is an idiomatic, open-source Java library for building LLM-powered applications on the JVM. It offers a unified API over popular LLM providers and v
Complete production stack for AI teams
Open-source LLM tracing & evaluation for AI optimization
Build reliable AI apps with comprehensive observability
⚡️next-generation personal AI assistant powered by LLM, RAG and agent loops, supporting computer-use, browser-use and coding agent, demo: https://demo.openagent
Enterprise workplace AI with data you own and control
Knowhere extracts, parses, and outputs structured chunks ready for AI Agents and RAG.
Langtrace 🔍 is an open-source, Open Telemetry based end-to-end observability tool for LLM applications, providing real-time tracing, evaluations and metrics f
OpenChatBI is an intelligent chat-based BI tool powered by large language models, designed to help users query, analyze, and visualize data through natural lang
Open-source runtime AI agent security tool - monitors and controls AI agents, catching malicious tool use, prompt injection, and policy drift in real time, befo
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Frequently asked questions
How many open source langchain projects are there?
This registry tracks 20 projects tagged langchain, with 528,480 GitHub stars between them. The most-adopted is langchain at 146,538 stars.
Are these langchain projects free to use?
Yes — 16 of the 20 carry an explicit open-source licence across 4 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which langchain project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these langchain projects still maintained?
17 of the 20 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.