===Collaborative editing===

  * [[etherpad]] / google docs / etherpad-lite
    * http://etherpad.org/
    * https://github.com/hackpad/hackpad (open source fork of hackpad (aquired by dropbox) which was in turn based on etherpad (aquired by google). more modern UI/UX focus than etherpad.)
    * https://firepad.io/#1  (requires hosted db)
  * http://socrates.io/ (free as in "running on someone else's computer")
  * ckeditor -> https://ckeditor.com/collaborative-editing/collaboration-features/

(merge from [[collaborative design]] at some point...)