Firepad : Firepad is an open-source, collaborative code and text editor. It is designed to be embedded inside larger web applications.
Bottery : Bottery is a syntax, editor, and simulator for prototyping generative contextual conversations modeled as finite state machines.
EtherPad : Etherpad is an Open Source online editor providing collaborative editing in really real-time powered by Node.js
MUTE : Web-based text editing tool that allows to edit documents collaboratively in real-time. It implements a CRDT-based consistency maintenance algorithm f...
MobWrite converts forms and web applications into collaborative environments. Create a simple single-user system, add one line of JavaScript, and instantly get a collaborative system.