Haystack
Open-source Python framework for building modular RAG pipelines and AI agents ready for production deployment.
About
Haystack is an open-source framework from deepset for constructing AI applications as composable pipelines. Developers connect components such as document retrievers, embedding models, LLMs, and external APIs into flexible graphs, then serialize and manage the configuration for reproducible deployments. It is particularly popular for retrieval-augmented generation (RAG) systems and multi-step AI agents. The library ships with a large component catalogue and supports custom components and the Model Context Protocol. The core framework is free and open source; deepset also offers enterprise tiers with managed infrastructure, visual design tools, and private support.