Langflow

Langflow is a visual, low-code tool for building and deploying AI-powered agents and workflows — users drag and drop components (models, tools, memory, retrievers) onto a canvas to construct pipelines, then deploy the result as an API without writing orchestration code by hand. It sits on top of Python/LangChain-style building blocks while abstracting away the boilerplate, making it popular for prototyping agentic systems and RAG pipelines quickly. With over 150,000 GitHub stars, it's one of the most adopted visual agent-building tools in the open-source AI ecosystem.