Haystack

Haystack is an open-source AI orchestration framework designed for building production-ready, LLM-powered agents and applications. It provides modular pipelines that orchestrate retrieval, reasoning, memory, and tool use with full transparency and debugging capabilities. Haystack integrates freely with major AI providers (OpenAI, Anthropic, Mistral, Hugging Face) and vector databases (Weaviate, Pinecone, Elasticsearch) without vendor lock-in. The framework supports rapid prototyping and seamless deployment to production using the same composable building blocks, with built-in reliability, observability, and Kubernetes readiness. Use cases include advanced RAG, AI agents, multimodal AI, conversational AI, and content generation, backed by an active community and enterprise support options.