Haystack is an open-source end-to-end framework that allows you to build applications powered by LLMs, Transformer models, vector search and more. Whether you want to perform retrieval-augmented generation (RAG), document search, question answering, or build agent-based workflows, Haystack can orchestrate state-of-the-art embedding models and LLMs into pipelines to build end-to-end NLP applications and solve your use case. Haystack has also an active Discord community you can join to learn more about the framework and get help if you face problems.
In early 2024 Haystack published a major release (2.0), which was a full redesign of the framework. During my time at deepset leading this redesign has been one of my major accomplishments.