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RAG framework

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Haystack

RAG framework

deepset's open-source RAG framework: typed component pipelines, YAML serialization, and enterprise connectors under Apache-2.0.

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LangChain

RAG framework

The most-adopted LLM framework, rebuilt on LangGraph in 1.0: durable agent execution, 1,000+ integrations, MIT-licensed; LangSmith is the paid layer.

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LlamaIndex

RAG framework

RAG-first data framework for LLM apps: 160+ connectors, purpose-built indexes, MIT-licensed; LlamaCloud adds managed parsing and indexing.

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