Haystack

Open-source AI orchestration framework by deepset for building production-ready LLM applications in Python. Core abstraction is the Pipeline — a computation graph of Components (embedders, retrievers, generators, rankers, etc.) connected via explicit typed edges. Supports RAG, agents, semantic search, and multimodal workflows. Integrates with OpenAI, Anthropic, Mistral, Hugging Face, Azure, Bedrock, and 70+ vector databases and document stores.