Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
RexPad - Nimble collaborative note-taking.
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Indigrid - Plain text outliner with side-by-side views.
Additor beta - Pocket and Evernote got a minimal and collaborative baby
Etherpad - Etherpad is a highly customizable Open Source online editor providing collaborative editing in...