PBworks

With over 1,000,000 communities using PBworks to collaborate publicly and privately, PBworks is the largest business and educational wiki host in the world. PBworks serves teams at over a third of the Fortune 500, is home to three presidential campaigns, the United Nations, The Financial Times and Harvard University. Like Salesforce, PBworks is a paid subscription service, with no advertising.

PBworks hosts collaborative wikis that can be used by anyone and for anything, featuring a setup that takes less time than making a peanut butter sandwich and easy, point-and-click editing. Users can insert video and photos, chat rooms, voice chat, community calendars and all other sorts of media which can then be rearranged or added to by other users given access privilege.