Wiki Spot is a nonprofit, member-supported effort dedicated to helping communities use and maintain wikis - a Wiki farm.
"We provide the means for communities anywhere in the world to initiate, maintain, publicize and fund wikis. We provide a trusting home for wikis through our Wikispot.org service, encourage development of collaborative software, and promote adoption of the wiki as a tool for enriching communities".
Wikis with community benefit can create wikis free of charge, INCLUDING ANY creative commons license they want. See the Wiki Directory for a list of Wiki Spot wikis.
The site has a building community guide