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LlamaIndex
Data framework for LLM applications. Connect custom data sources to large language models.
About LlamaIndex
LlamaIndex (formerly GPT Index) is a data framework for building LLM applications. It provides the tools to ingest, structure, and access private or domain-specific data for use with large language models, with a focus on retrieval-augmented generation (RAG).
Key Features
✓ Data connectors for 160+ sources
✓ Advanced RAG pipelines
✓ Index structures (vector, tree, keyword)
✓ Query engines & chat engines
✓ Agent framework
✓ Evaluation & observability
Why choose LlamaIndex?
LlamaIndex is an open source alternative to LangChain, Haystack. Licensed under MIT, it gives you full access to the source code and the freedom to modify, self-host, and contribute. It is available as a desktop or web application.