Wetpaint
from Diigo
Wikia - Wikia
ElWiki - Free Wiki Hosting with Free .com Domain
PBwiki.com | Free Collaborative Editing & Publishing
Wikidot - Free Wiki Hosting
@Wiki FREE Wiki Hosting Service
The first free online participative suite - NETCIPIA
Welcome to Wikispaces - Wikis for Everyone
Cospire.com - FREE Knowledge Management Wiki System
Create a Wiki - Intodit.com
Scribbo - Put a Wiki on Your Website
dooWikis » Wikis for You or Your Website
SlimWiki — Beautiful Wikis for Teams