Haystack NLP

Haystack by deepset is an open-source NLP framework specifically designed for building question answering, semantic search, and retrieval-augmented generation systems at production scale. It provides modular components for document stores, retrievers, readers, and generators that can be combined into custom NLP pipelines supporting dozens of LLMs and vector databases. Engineering teams building enterprise search, knowledge base QA, and document intelligence applications use Haystack for its production maturity, flexibility, and active open-source community.