Wiki service

Wetpaint is one of the most intuitive wiki hosts. It has a wide range of nice wiki page designs to choose from.

PBWiki offers a wiki hosting service with advanced features. It is easy to upgrade an account to adapt to increased demands.

Wikia host community wikis for free. The service runs on the same software that powers Wikipedia.

With Wikispaces you can create simple web pages which can be edited by a group of people.