LangChain
Open-source framework for building LLM-powered applications with chains, agents, memory, and retrieval-augmented generation.
Features
- Composable chains for multi-step LLM workflows
- Agent framework with 100+ pre-built tools
- LangSmith for tracing, testing, and monitoring LLM apps
- LangGraph for stateful, multi-agent orchestration
- Integrations with 100+ LLMs, vector stores, and data sources
LangChain is the most widely adopted open-source framework for building applications powered by large language models. It provides abstractions for connecting LLMs to external data sources, APIs, and memory, enabling retrieval-augmented generation (RAG), tool-using agents, and complex multi-step workflows. The ecosystem also includes LangSmith for observability and LangGraph for building stateful multi-agent systems.
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