Dify
dify.ai
Open-source LLM application platform for building, deploying, and monitoring AI workflows, agents, and chatbots — self-hostable or cloud-hosted.
Why it is useful
Dify combines prompt engineering, RAG, agent orchestration, and observability in a single platform. The visual workflow editor supports branching logic, and the built-in monitoring shows token usage and performance per step. Stands out from similar tools with strong production-readiness features.