Bizwiki The UK Business Wiki. Add, review, discuss and find the best companies around you.
CogMap: The Org Chart Wiki. This is an organizational chart maker wiki that allows you to see, edit and create organization charts for companies online.
WikiMatrix - Compare them all. Huge collection of wikis. Single best source to visit.
ServerSideWiki. Designed to be small, quick and fast.
LW: - LittleWiki. Create public pages or private ones for groups organizations and clubs.
OttoWiki - Wikis for everyone. Free and easy apparently.
Link: Wetpaint. Free, easy tools for creating wiki web sites where the readers are also the writers. Currently closed beta
Link: MediaWiki. Want a wiki? Mediawiki was originally written for the Wikipedia, but it's free software that anyone can use.
Link: Schtuff?. Free hosting, picture sharing, whole bunch of stuff.
Link: Jotspot - The Application Wiki.Free and commercial versions.