EditMe: Provides wiki and content-managed website hosting.
LittleWiki: LittleWiki allows one to create free public and private wiki content areas.
Schtuff: A free wiki farm with flexible membership and permission options and file upload. Up to 200 MBytes and 3 wikis allowed per user.
SeedWiki: A Wiki Farm where basic Wikis are free. Offers plugins that allow applications and web sites to be built on a Wiki Framework.
Swiki.net: A wiki farm offering free hosting of Swiki (Squeak Wiki) based wikis.
Wikia: A collection of freely-hosted wiki communities using the same MediaWiki software that Wikipedia uses.
Wikispaces: A free wiki host providing community wiki spaces, visual page editing, and discussion areas.