Pad.UP is a so-called "Etherpad". In Pad.UP you can create and work on simple text documents together with others. All changes are distributed in real time to all other contributors. The changes and the origin of the change are always traceable.
You make your created documents or pads easily available via web links that you send to others.
Pad.UP was realized by eLiS and is currently operated by ZIM. In the future it will be replaced by a collaborative document management in Box.UP.