Zwiki is.. a powerful, innovative, user-friendly wiki engine based on the Zope 2 platform. This project has been developed since 1999 by Simon Michael and contributors around the world, powers many Zope and non-Zope-related wikis, and is free software released under the GNU GPL . Please explore the site, and enjoy the software. Your questions, comments, patches and donations are most welcome!
“EtherPad has killed wikis, whiteboards and to-do lists for everything from meeting notes to writing copy to issue tracking.” EtherPad shows Google Docs how it's done