Langflow

Langflow is a visual builder for LLM agents and RAG workflows. It exposes a drag-and-drop canvas for chaining components such as prompts, retrievers, vector stores, tools, and model calls and turns each finished workflow into a callable API and a Model Context Protocol server. Python-based with custom-component support, distributed as a desktop app for Windows and macOS or self-installable via pip. MIT licensed; maintained at DataStax.