The LangChain showcase

Discover the best projects built with LangChain

A hand-curated, daily-updated gallery of open-source projects. Browse the ecosystem, ranked by GitHub stars.

Most stars

AllAI & ML1305DevTools27Docs5Blogs3Dashboards3

1351 projects

Python tool for converting files and office documents to Markdown. Maintained by microsoft on GitHub, where it has earned 171,533 stars from the community.

User-friendly AI Interface (Supports Ollama, OpenAI API,...). Maintained by open-webui on GitHub, where it has earned 151,673 stars from the community.

An open-source long-horizon SuperAgent harness that researches, codes, and creates. With the help of sandboxes, memories, tools, skill, subagents and message gateway, it handles different levels of tasks that could take minutes to hours. Maintained by bytedance on GitHub, where it has earned 79,319 stars from the community.

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. Maintained by headroomlabs-ai on GitHub, where it has earned 74,514 stars from the community.

Hheadroomlabs-ai

The fastest, litest AI Gateway. Rust core with Python SDK. Call 100+ LLM APIs in OpenAI (or native) format with cost tracking, guardrails, load balancing, and logging [Bedrock, Azure, OpenAI, Anthropic, OpenAI, VertexAI, vLLM, Nvidia NIM]. Maintained by BerriAI on GitHub, where it has earned 55,577 stars from the community.

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. Maintained by PostHog on GitHub, where it has earned 39,750 stars from the community.

Build resilient agents. Maintained by langchain-ai on GitHub, where it has earned 38,916 stars from the community.

Langchain-Chatchat（Langchain-ChatGLM） Langchain ChatGLM, Qwen Llama RAG Agent | Langchain-Chatchat (formerly langchain-ChatGLM), local knowledge based LLM (like ChatGLM, Qwen and Llama) RAG and Agent app with langchain. Maintained by chatchat-space on GitHub, where it has earned 38,506 stars from the community.

Cchatchat-space

A boilerplate for Node.js web applications. Maintained by sahat on GitHub, where it has earned 35,235 stars from the community.

Open source AI engineering platform: LLM evals, observability, metrics, prompt management, playground, datasets. Integrates with OpenTelemetry, LangChain, OpenAI SDK, LiteLLM, and more. YC W23. Maintained by langfuse on GitHub, where it has earned 32,533 stars from the community.

Open Source AI Platform - AI Chat with advanced features that works with every LLM. Maintained by onyx-dot-app on GitHub, where it has earned 31,937 stars from the community.

This repository contains the Hugging Face Agents Course. Maintained by huggingface on GitHub, where it has earned 30,682 stars from the community.

This repository showcases various advanced techniques for Retrieval-Augmented Generation (RAG) systems. Each technique has a detailed notebook tutorial. Maintained by NirDiamant on GitHub, where it has earned 28,943 stars from the community.

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. Maintained by mlflow on GitHub, where it has earned 27,368 stars from the community.

The batteries-included agent harness. Maintained by langchain-ai on GitHub, where it has earned 27,338 stars from the community.

50+ tutorials and implementations for Generative AI Agent techniques, from basic conversational bots to complex multi-agent systems. Maintained by NirDiamant on GitHub, where it has earned 23,630 stars from the community.

MaxKB is an open-source platform for building enterprise-grade agents. 。. Maintained by 1Panel-dev on GitHub, where it has earned 22,402 stars from the community.

Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards. Maintained by comet-ml on GitHub, where it has earned 21,117 stars from the community.

Welcome to the Llama Cookbook! This is your go to guide for Building with Llama: Getting started with Inference, Fine-Tuning, RAG. We also show you how to solve end to end problems using Llama model family and using them on various provider services. Maintained by meta-llama on GitHub, where it has earned 18,552 stars from the community.

Production-grade platform for building agentic IM bots - / Agent、、 / Bots for Discord / Slack / LINE / Telegram / WeChat / / / QQ / Matrix e.g. Integrated with ChatGPT(GPT), DeepSeek, Dify, n8n, Langflow, Coze, Claude, Gemini, GLM, Ollama, SiliconFlow, Moonshot, openclaw / hermes agent, deerflow. Maintained by langbot-app on GitHub, where it has earned 18,032 stars from the community.

Sample code and notebooks for Generative AI on Google Cloud, with Gemini Enterprise Agent Platform. Maintained by GoogleCloudPlatform on GitHub, where it has earned 17,549 stars from the community.

GGoogleCloudPlatform

Open-source NotebookLM alternative. Research the open web with live data(Reddit, YT, IG, TikTok, Indeed, Google Search, Maps etc) through one platform, API or MCP server. Join our Discord: https://discord.gg/ejRNvftDp9. Maintained by MODSetter on GitHub, where it has earned 16,092 stars from the community.

Convert documents to structured data effortlessly. Unstructured is open-source ETL solution for transforming complex documents into clean, structured formats for language models. Visit our website to learn more about our enterprise grade Platform product for production grade workflows, partitioning, enrichments, chunking and embedding. Maintained by Unstructured-IO on GitHub, where it has earned 15,256 stars from the community.

UUnstructured-IO

The open-source hub to build & deploy GPT/LLM Agents. Maintained by botpress on GitHub, where it has earned 14,847 stars from the community.

，：https://datawhalechina.github.io/llm-universe/. Maintained by datawhalechina on GitHub, where it has earned 13,713 stars from the community.

Ddatawhalechina

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 vector stores, and makes implementing tool calling (including MCP support), agents and RAG easy. It integrates seamlessly with enterprise Java frameworks like Quarkus and Spring Boot. Maintained by langchain4j on GitHub, where it has earned 12,790 stars from the community.

[MLsys2026]: RAG on Everything with LEANN. Enjoy 97% storage savings while running a fast, accurate, and 100% private RAG application on your personal device. Maintained by StarTrail-org on GitHub, where it has earned 12,761 stars from the community.

A blazing fast AI Gateway with integrated guardrails. Route to 1,600+ LLMs, 50+ AI Guardrails with 1 fast & friendly API. Maintained by Portkey-AI on GitHub, where it has earned 12,646 stars from the community.

The ultimate LLM/AI application development framework in Go. Maintained by cloudwego on GitHub, where it has earned 12,589 stars from the community.

Build Conversational AI in minutes. Maintained by Chainlit on GitHub, where it has earned 12,360 stars from the community.

AI Observability & Evaluation. Maintained by Arize-ai on GitHub, where it has earned 10,902 stars from the community.

：RAG ，：https://datawhalechina.github.io/all-in-rag/. Maintained by datawhalechina on GitHub, where it has earned 10,055 stars from the community.

Ddatawhalechina

LangChain for Go, the easiest way to write LLM-based programs in Go. Maintained by tmc on GitHub, where it has earned 9,589 stars from the community.

LangChain. Maintained by liaokongVFX on GitHub, where it has earned 9,082 stars from the community.

~95% on SimpleQA (e.g. Qwen3.6-27B on a 3090). Supports all local and cloud LLMs (llama.cpp, Ollama, Google,...). 10+ search engines - arXiv, PubMed, your private documents. Everything Local & Encrypted. Maintained by LearningCircuit on GitHub, where it has earned 8,848 stars from the community.

LLearningCircuit

Semantic cache for LLMs. Fully integrated with LangChain and llama_index. Maintained by zilliztech on GitHub, where it has earned 8,122 stars from the community.

Use your locally running AI models to assist you in your web browsing. Maintained by n4ze3m on GitHub, where it has earned 8,110 stars from the community.

https://adongwanai.github.io/AgentGuide | AI Agent | LangGraph | RAG | | | | | ｜. Maintained by adongwanai on GitHub, where it has earned 7,853 stars from the community.

22 prompt engineering techniques with hands-on Jupyter Notebook tutorials, from fundamental concepts to advanced strategies for leveraging LLMs. Maintained by NirDiamant on GitHub, where it has earned 7,753 stars from the community.

The Enterprise-Grade Multi-Agent Orchestration Framework. Website: https://swarms.ai. Maintained by kyegomez on GitHub, where it has earned 7,031 stars from the community.

Turn any webpage into structured data using LLMs. Maintained by mishushakov on GitHub, where it has earned 6,895 stars from the community.

Self-hosted AI accounting app. LLM analyzer for receipts, invoices, transactions with custom prompts and categories. Maintained by vas3k on GitHub, where it has earned 6,580 stars from the community.

Memory library for building stateful agents. Maintained by plastic-labs on GitHub, where it has earned 6,433 stars from the community.

Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23. Maintained by Helicone on GitHub, where it has earned 6,034 stars from the community.

Python SDK for AI agent monitoring, LLM cost tracking, benchmarking, and more. Integrates with most LLMs and agent frameworks including CrewAI, Agno, OpenAI Agents SDK, Langchain, Autogen, AG2, and CamelAI. Maintained by AgentOps-AI on GitHub, where it has earned 5,751 stars from the community.

Next-generation AI Agent Optimization Platform: Cozeloop addresses challenges in AI agent development by providing full-lifecycle management capabilities from development, debugging, and evaluation to monitoring. Maintained by coze-dev on GitHub, where it has earned 5,665 stars from the community.

next-generation personal AI assistant powered by LLM, RAG and agent loops, supporting computer-use, browser-use and coding agent, demo: https://demo.openagentai.org. Maintained by the-open-agent on GitHub, where it has earned 5,491 stars from the community.

Tthe-open-agent

The open source platform for AI-native application development. Maintained by TaskingAI on GitHub, where it has earned 5,396 stars from the community.

2026 AI Agent ｜ · + + · · LangChain / LangGraph / Coze / Dify / MCP / skills / LLM / RAG / · · 0 + +. Maintained by didilili on GitHub, where it has earned 5,075 stars from the community.

Argilla is a collaboration tool for AI engineers and domain experts to build high-quality datasets. Maintained by argilla-io on GitHub, where it has earned 5,069 stars from the community.

Neo4j graph construction from unstructured data using LLMs. Maintained by neo4j-labs on GitHub, where it has earned 4,983 stars from the community.

Autonomous Hacking Agent for Red Team. Maintained by PurpleAILAB on GitHub, where it has earned 4,980 stars from the community.

An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and management. Optimizes Agent & Tool calling, and supports plugins. Maintained by IBM on GitHub, where it has earned 4,578 stars from the community.

AI observability platform for production LLM and agent systems. Maintained by pydantic on GitHub, where it has earned 4,508 stars from the community.

35 production-grade agentic AI architectures (Reflexion, LATS, GraphRAG, MemGPT, Voyager, BrowserAgent,...) — a Python library and runnable textbook with multi-provider LLM support and a 17-task benchmark leaderboard. Maintained by FareedKhan-dev on GitHub, where it has earned 4,064 stars from the community.

FFareedKhan-dev

Easiest and laziest way for building multi-agent LLMs applications. Maintained by LazyAGI on GitHub, where it has earned 3,860 stars from the community.

A modular Agentic RAG built with LangGraph — learn Retrieval-Augmented Generation Agents in minutes. Maintained by GiovanniPasq on GitHub, where it has earned 3,857 stars from the community.

Open source implementation of the ChatGPT Code Interpreter. Maintained by shroominic on GitHub, where it has earned 3,847 stars from the community.

Cascading runtime for AI agents. Optimize cost, latency, quality, and policy decisions inside the agent loop. Maintained by lemony-ai on GitHub, where it has earned 3,838 stars from the community.

LangChain MCP. Maintained by langchain-ai on GitHub, where it has earned 3,622 stars from the community.

What is LangChain?

LangChain is the framework for building LLM apps with chains, agents, tools, and memory. This gallery lists 1,351 open-source projects built with LangChain, most of them in AI & ML, DevTools and Docs, ranked by GitHub stars so the most-adopted repositories come first.

How projects are selected

Projects are public GitHub repositories found with the GitHub search query “topic:langchain” and at least 20 stars. Each repository is checked against LangChain’s languages and ecosystem before it is categorized, and stars, forks and last-commit dates come straight from the GitHub API, refreshed daily (current snapshot: October 6, 2026). Nothing here is paid placement.

LangChain projects: FAQ

How many open-source LangChain projects are listed?: 1,351 open-source projects built with LangChain are listed, sourced from public GitHub repositories as of October 6, 2026.
What is the most-starred LangChain project on GitHub?: markitdown by microsoft leads with 171,533 GitHub stars (171.5k), followed by open-webui with 151,673.
What kinds of projects are built with LangChain?: The largest category is AI & ML, with 1,305 projects (97% of the gallery), followed by DevTools with 27. Projects span 11 categories in total.
Which license do most LangChain projects use?: MIT is the most common license, used by 601 of 1,351 projects (44%); Apache-2.0 is next with 235. 418 projects declare no recognized license.

From the blog

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Video archive

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