haystack

Why we included this project

Haystack is a Python framework for building production LLM applications from small, composable components. You assemble those components into explicit pipelines, so you decide how retrieval, routing, memory, and generation fit together instead of accepting a black-box stack. That control is what makes it a good fit for RAG and agent systems where you need to know exactly what happens at each step of a request. The component model is easy to extend, and the built-in integrations cover vector stores, model providers, and document loaders, so custom logic can sit right next to the standard pieces. It is a solid choice once you are past the prototype stage and need clear seams for testing, observability, and swapping parts as requirements change.