Langflow

Langflow is a low code visual builder for AI agents, retrieval augmented generation applications and MCP servers. Developers assemble flows by dragging components onto a canvas, then run them or expose them as an API. The platform supports the major LLMs and vector databases and a growing library of components and data sources, including connections to tools such as Slack, Google Drive, Notion, GitHub and Gmail. Everything is Python underneath, so developers can customize components in code. Users can run a single agent or a group of agents that use the available components as tools, swap and compare models, and start from pre built flows and components shared by others. Flows can be deployed by the user or on Langflow's cloud, and the same Langflow runs in the open source and cloud versions. It is aimed at developers and AI teams who want to prototype quickly and move the same flow into production without writing boilerplate. The open source version is free. The site describes a free cloud account for deployment and points to an enterprise grade cloud, but publishes no paid plan prices.