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Haystack

Free tier

The open-source AI framework for production-ready agents, RAG & context engineering

Free tier available·Technical·Powered by Agnostic (OpenAI, Anthropic, Mistral, Hugging Face, and more)·API available·Open source
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Key strengths

Modular, composable pipeline architecture with full transparency and debuggabilityVendor-agnostic integrations across LLMs, vector stores, and data sourcesProduction-ready with Kubernetes support, serializable pipelines, and cloud-agnostic deploymentSupports advanced RAG, agentic workflows, multimodal AI, and conversational AIStrong open-source community with enterprise support and platform tiers available
Free tier + paid plans
Berlin, Germany
Self-hostable
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Haystack is a Python-based AI orchestration framework that structures AI workloads as directed pipelines of composable components (retrievers, generators, rankers, routers, etc.). Pipelines are serializable (YAML/JSON), cloud-agnostic, and Kubernetes-ready, supporting complex patterns like branching, looping, and self-correction for agentic workflows. It integrates natively with leading LLM providers (OpenAI, Anthropic, Mistral, Hugging Face) and vector stores (Weaviate, Pinecone, Elasticsearch) via a standardized interface, and supports Jinja-2 templating for prompt engineering. An enterprise platform layer adds a visual pipeline designer, secure access controls, auditability, and on-prem or cloud deployment options.