Wiki+Tools

Wikispaces – ad free for educators http://www.wikispaces.com/

Wetpaint – ad free for educators http://www.wetpaint.com/ Wikia http://www.wikia.com/wiki/Wikia Pbwiki – ad free for educators http://pbwiki.com/education.wiki Bluwiki – free wiki with tons of tools http://www.bluwiki.com/