Flowhub is a web-based IDE for flow-based programming. It is built on NoFlo.js for both client and server. It can connect to any language or environment that can talk the FBP Network Protocol.
Which is kind of nonsense unless I'm already clear what "flow-based programming" was. Which I wasn't until I google'd that. Maybe its me. It seems if you're going to promote a new tool with for a obscureish programming paradigm you might want to explain the paradigm as well.