Dify
A visual platform for building LLM applications and agents through workflows, retrieval pipelines, model connections and observability, hosted or self-managed.

Overview
A visual platform for building LLM applications and agents through workflows, retrieval pipelines, model connections and observability, hosted or self-managed.
Visual AI workflow construction and testing · RAG and knowledge pipelines · Model-provider integrations and agent application management
Visual agent & workflow builders · Modified Apache-2.0; extra restrictions
Original source & installation instructions
Its modified Apache-2.0 licence restricts specified multi-tenant commercial use and frontend branding changes; self-hosting and model/provider costs remain separate.