• PBworks: Free Collaboration, Intranet, Extranet, Project Management, Business Wiki
  If you really can't afford our prices ($20/user/month for Project Edition, $100/year for Classroom Edition), PBworks offers a free Basic Edition.
  in Public bookmarks with csm hosted wiki by 4 users
• Welcome to Wikispaces - Free Wikis for Everyone
  Free: 2GB, max file size:10MB
  Wikis are simple web pages that groups, friends, and families can edit together. Starting your wiki at Wikispaces is fast, free, and easy.
  in Public bookmarks with csm hosted wiki by 21 users
• Yuku - Free Hosted Blogs, Message Boards and MORE!
  in webapps > publishing with blogs free hosted message online publish software webapps yuku by 4 users (all private)

hosted from all users