LlamaIndex
LlamaIndex is a data framework for building LLM-powered applications by connecting large language models with external data sources.
LlamaIndex is an open-source data orchestration framework designed to help developers build LLM-powered agents over their private or domain-specific data. It provides tools for data ingestion from various sources (APIs, PDFs, SQL, etc.), structuring data into indexes for efficient retrieval, and offering query engines for natural language access. The platform has evolved beyond just RAG to a comprehensive agentic document processing platform, including capabilities like agentic OCR and workflow builders for intelligent agents that reason over complex documents.
LlamaIndex secured strong funding ($27.5M total) and launched enterprise-grade LlamaCloud, establishing itself as a key player in the RAG/data framework space with 48K GitHub stars. While it has excellent ratings (4.8/5 G2) and broad LLM integrations, it operates in LangChain's shadow as the secondary choice in AI orchestration frameworks.
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