20 Open-Source RAG Tools Worth Knowing in 2026, From Frameworks to Rerankers
MaryamMiradi · x · 2026-10-12
Maryam Miradi maps the open-source RAG ecosystem into five categories: frameworks (LlamaIndex, Haystack, LangChain, RAGFlow), vector/hybrid search (Qdrant, Weaviate, Milvus, Chroma), retrieval models (BGE, ColBERT, Pyserini, PyLate), reranking (rerankers, FlashRank, RankLLM, BGE Reranker), and graph-based RAG (GraphRAG, LightRAG, HippoRAG). Her key point: a bigger vector database won't fix bad retrieval — quality depends on the whole path from indexing to what evidence reaches the model. She may benchmark these tools next.
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