LangChain
by Community
The agent engineering platform.
OSS
LangChain
Added 1 June 2026
Overview
LangChain is a Python framework for building applications with large language models through composable chains, agents, and memory abstractions. It provides tools to connect LLMs to external data sources, APIs, and reasoning loops, reducing boilerplate for common patterns like retrieval-augmented generation and multi-step workflows.
Best for
Best for
Python developers building prototype or production LLM applications that need to orchestrate multiple tools and data sources
Use cases
- Building retrieval-augmented generation (RAG) systems that query documents before generating responses
- Creating multi-step agent workflows that reason and call external tools or APIs
- Prototyping LLM applications with pluggable model and data source integrations
Notes
LangChain is a Python framework for building applications with large language models through composable chains, agents, and memory abstractions. It provides tools to connect LLMs to external data sources, APIs, and reasoning loops, reducing boilerplate for common patterns like retrieval-augmented generation and multi-step workflows.
138,234 stars on GitHub. Last updated 2026-06-01. Licensed MIT.
Use cases
- Building retrieval-augmented generation (RAG) systems that query documents before generating responses
- Creating multi-step agent workflows that reason and call external tools or APIs
- Prototyping LLM applications with pluggable model and data source integrations
Pros
- Large ecosystem of integrations with LLM providers, vector stores, and external tools
- Well-established patterns for common tasks like document loading, chunking, and memory management
- Active community with extensive documentation and examples
Cons
- Steep learning curve for complex agent design and debugging chains in production
- Frequent API changes and deprecations across versions can break existing code
- Abstraction layers can obscure underlying LLM behavior and increase latency
Indexed from awesome-llm and enriched against its public facts.
Pros
- Large ecosystem of integrations with LLM providers, vector stores, and external tools
- Well-established patterns for common tasks like document loading, chunking, and memory management
- Active community with extensive documentation and examples
Cons
- Steep learning curve for complex agent design and debugging chains in production
- Frequent API changes and deprecations across versions can break existing code
- Abstraction layers can obscure underlying LLM behavior and increase latency
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At Maxim AI, we are building the production infrastructure for AI. Maxim’s stack comprising gateway and governance, observability, and evals empowers AI teams to ship agents with
mem0
mem0
Memory layer for AI apps. Personalisation, continuity, and recall as a service.
Milvus
Community
Milvus is a high-performance, cloud-native vector database built for scalable vector ANN search
Mixtral-8x7B
Community
The most powerful AI platform for enterprises. Customize, fine-tune, and deploy AI assistants, autonomous agents, and multimodal AI with open models.
MLflow
Community
MLflow - Open Source AI Platform for Agents, LLMs & Models
Modelz-LLM
Community
OpenAI compatible API for LLMs and embeddings (LLaMA, Vicuna, ChatGLM and many others)
MPT-7B
Community
Introducing MPT-7B, the first entry in our MosaicML Foundation Series. MPT-7B is a transformer trained from scratch on 1T tokens of text and code. It is open source, available fo
Nemotron-4-340B
Community
We’re on a journey to advance and democratize artificial intelligence through open source and open science.
ollama
Community
Get up and running with Kimi-K2.5, GLM-5, MiniMax, DeepSeek, gpt-oss, Qwen, Gemma and other models.
Open Responses
Community
OpenAI o3-mini
Community
Pushing the frontier of cost-effective reasoning.
OpenELM-1.1|3B
Community
We’re on a journey to advance and democratize artificial intelligence through open source and open science.
OpenLIT
Community
Open source platform for AI Engineering: OpenTelemetry-native LLM Observability, GPU Monitoring, Guardrails, Evaluations, Prompt Management, Vault, Playground. 🚀💻 Integrates with
OpenLLM
Community
Run any open-source LLMs, such as DeepSeek and Llama, as OpenAI compatible API endpoint in the cloud.
Opik
Community
Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.
Parea AI
Community
The experimentation and human annotation platform for AI teams.
Pezzo 🕹️
Community
🕹️ Open-source, developer-first LLMOps platform designed to streamline prompt design, version management, instant delivery, collaboration, troubleshooting, observability and more.
pgvector
Community
Open-source vector similarity search for Postgres
Pinecone
Community
Search through billions of items for similar matches to any object, in milliseconds. It’s the next generation of search, an API call away.
Plexiglass
Community
A toolkit for detecting and protecting against vulnerabilities in Large Language Models (LLMs).
Portkey
Community
Democratize and productionize Gen AI across your entire org with Portkey
promptfoo
Community
Test your prompts, agents, and RAGs. Red teaming/pentesting/vulnerability scanning for AI. Compare performance of GPT, Claude, Gemini, DeepSeek, and more. Simple declarative config
PromptHub
Community
Test, deploy, and manage your prompts with PromptHub, a prompt management tool for teams. Keep your prompts organized and leverage top-tier templates to get more out of AI.
Promptify
Community
Prompt Engineering | Prompt Versioning | Use GPT or other prompt based models to get structured output. Join our discord for Prompt-Engineering, LLMs and other latest research
PromptLayer 🍰
Community
Version, test, and monitor every prompt and agent with robust evals, tracing, and regression sets. Empower domain experts to collaborate in the visual editor.
PromptMage
Community
simplifies the process of creating and managing LLM workflows.
PromptPerfect
Community
PromptPerfect - AI Prompt Generator and Optimizer
PromptSite
Community
PromptSite is a lightweight prompt version management package that helps you version control, track, experiment and debug with your LLM prompts with ease.
Puzzlet AI
Community
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Qdrant
Community
Qdrant - High-performance, massive-scale Vector Database and Vector Search Engine for the next generation of AI. Also available in the cloud https://cloud.qdrant.io/
Qwen2.5-Max
Community
QWEN CHAT API DEMO DISCORD It is widely recognized that continuously scaling both data size and model size can lead to significant improvements in model intelligence. However, th
Ragas
Community
Supercharge Your LLM Application Evaluations 🚀
RecurrentGemma-2B
Community
Open weights language model from Google DeepMind, based on Griffin.
ReLLM
Community
Exact structure out of any language model completion.
Rivestack
Community
Managed pgvector on dedicated PostgreSQL with NVMe storage. 2,000 QPS at sub-4ms p50, from $35/month, migration help from Supabase, Neon, Pinecone, and self-hosted.
Robocorp
Community
Create 🐍 Python AI Actions and 🤖 Automations, and deploy & operate them anywhere
semantic-coverage
Community
Automated detection of knowledge gaps and blind spots in RAG vector stores.
SGLang
Community
SGLang is a high-performance serving framework for large language models and multimodal models.
StableLM-v2-12B
Community
We’re on a journey to advance and democratize artificial intelligence through open source and open science.
Statewave
Community
Open-source memory runtime for AI agents — reproducible, provenance-tagged context bundles instead of query-time retrieval. Apache-2.0, self-hosted on Postgres + pgvector, Python +
Swiss Army Llama
Community
A FastAPI service for semantic text search using precomputed embeddings and advanced similarity measures, with built-in support for various file types through textract.
Temporal
Temporal
Durable execution at enterprise scale. The control plane that survives anything.
Text-Embeddings-Inference
Community
A blazing fast inference solution for text embeddings models
text-generation-inference
Community
Large Language Model Text Generation Inference
TGI
Community
We’re on a journey to advance and democratize artificial intelligence through open source and open science.
traceAI
Community
Open Source AI Tracing Framework built on Opentelemetry for AI Applications and Frameworks
Tune Studio
Community
Playground for devs to finetune & deploy LLMs
TypeChat
Community
TypeChat is a library that makes it easy to build natural language interfaces using types.
Vearch
Community
Distributed vector search for AI-native applications
vLLM
Community
A high-throughput and memory-efficient inference and serving engine for LLMs
VisualWebArena
Community
Project webpage for the VisualWebArena paper.
Weaviate
Community
Weaviate is an open-source vector database that stores both objects and vectors, allowing for the combination of vector search with structured filtering with the fault tolerance an
Weights & Biases
Community
W&B Weave helps developers evaluate, monitor, and iterate continuously to deliver generative AI applications with confidence.
AutoGen
Various
A programming framework for agentic AI
Awesome RAG Production
Various
A curated list of battle-tested tools, frameworks, and best practices for building scalable, production-grade Retrieval-Augmented Generation (RAG) systems.
Build an AI Agent (From Scratch)
Various
Build a working AI agent that can reason, plan, and execute multi-step tasks! LLM-powered AI agents are the next leap in applied AI, capable of reasoning and collaboration to ach
Cleanlab
Various
Check every AI response in real time with guardrails. Cleanlab detects hallucinations, missing context, and other issues by scoring each output for trust and accuracy.
Cohere
Various
Cohere builds powerful models and AI solutions enabling enterprises to automate processes, empower employees, and turn fragmented data into actionable insights.
Exa
Various
The Exa Web search API retrieves the best, realtime data from the web for your AI
Forefront
Various
Forefront is a platform to fine-tune and inference open-source-language-models.
Gemini
Various
A family of multimodal large language model developed by Google Deepmind.
Google AI Studio
Various
The fastest path from prompt to production with Gemini
Helicone AI
Various
AI Gateway & LLM Observability
MiniMax
Various
Building AGI with our mission Intelligence with Everyone. Global leader in multi-modal models and AI-native products with over 200 million users.
OpenAI API
Various
Announcement of the OpenAI API for text-to-text general-purpose AI models based on GPT-3. OpenAI blog, June 11, 2020.
QuillBot
Various
Write effortlessly and efficiently with Quillbot's suite of AI tools. Paraphrase, check grammar, analyze tone, improve fluency, and more. Start doing your best work.
You.com
Various
Skip the groundwork with our AI-ready Web Search APIs, delivering advanced search capabilities to power your next product.
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