Flowise

Flowise is an open-source, low-code tool for visually building LangChain- and LlamaIndex-based AI applications — drag nodes for models, vector stores, memory, and tools onto a canvas to build a chatbot, RAG pipeline, or agent without writing backend code. It's self-hostable and popular with developers who want LangChain's power without hand-wiring every integration themselves, and its marketplace covers pre-built templates for common use cases.