žWetpaint
¡The Wetpaint platform rolls features from wikis, blogs, and forums into what they call "your own social websiteFor teachers, they have a special page about Wikis in Education and an Educator Ambassador to personally answer any questions you might have about using a wiki in the classroom.
žWikispaces
¡Wikipsaces is another wiki platform with a special offer for teachers. Since 2006, they have given away over 100,000 wikis for K-12 education, and have announced a goal of adding another 250,000 to that number.
žPBWiki
¡PBWiki provides educators a 10MB wiki for an unlimited number of users for free. Key features include speedy setup, an audit trail of changes made to the wiki pages, RSS and email notification of wiki updates, IP whitelisting and blacklisting, and four roles to control access: Reader, Writer, Editor and Administrator.
žPikiWiki
¡PikiWiki is the easiest wiki to learn and a great one for elementary-age kids. With PikiWiki, even novice computer users can create unique, expressive web pages by dragging and dropping pictures, video, or any other media into their browser right from their computer desktop.
