LlamaIndex

LlamaIndexSince 2023-01

LlamaIndex is the premier open-source data framework designed to bridge private, enterprise, and unstructured data with large language models. By providing sophisticated data connectors, automated parser modules, semantic chunking algorithms, and multi-document index structures, LlamaIndex enables developers to build context-augmented LLM applications and autonomous knowledge retrieval engines with minimal boilerplate. From parsing complex multi-page PDF documents and financial spreadsheets to orchestrating complex Agentic RAG workflows that query multiple disparate databases, LlamaIndex handles the complete data ingestion, indexing, and query evaluation lifecycle.

Architected for production scale, LlamaIndex provides seamless abstractions for 160+ vector stores, SQL databases, knowledge graphs, and data loaders through LlamaHub. Its query engine supports hybrid vector-lexical searches, sub-question query decomposition, recursive retrieval, and reranking pipelines. With native support for LlamaParse (a state-of-the-art vision-based document parser) and LlamaCloud (a managed parsing and retrieval service), enterprise engineering teams can deploy enterprise-grade RAG applications with strict accuracy evaluation benchmarks and low token consumption.

LangChainSince 2022-10

The most popular framework for developing applications powered by large language models, including agents and RAG.

Provides components for memory, data retrieval, and tool usage.