Haystack

Haystack enables developers to orchestrate complex AI workflows with modular, reusable components. Its architecture separates concerns—data retrieval, prompt routing, memory management, tool integration—so you can build exactly what your application needs without inherited overhead.

Highlights

• Modular pipeline design: compose components for RAG, agents, semantic search, and context engineering
• Multi-model flexibility: work with OpenAI, Hugging Face, local models, and any vector database
• Production patterns built in: prompt routing, error handling, memory, and tool execution
• Strong community: thousands of projects on GitHub, Discord support, and real-world deployments at enterprise scale
• Completely open and free: no vendor lock-in, run locally or in the cloud as you choose

Ideal for developers and teams building enterprise-grade AI systems who want flexibility, transparency, and full control over their architecture. The open-source version is completely free and fully featured; deepset offers optional paid support and a commercial platform for teams needing visual pipeline design, managed hosting, and data workflow tools.