Good documentation can separate great software from good software. Documentation is an area where open source often beats proprietary solutions hands down. Often up to date and user friendly documentation for proprietary software does not exist, is not available or is restricted by software vendors or resellers for commercial gain.
The definition of a wiki aptly taken from Wikipedia, which of course is the most well know wiki, is as follows:
“A wiki is a collection of web pages designed to enable anyone who accesses it to contribute or modify content, using a simplified markup language.Wikis are often used to create collaborative websites and to power community websites.”
A have put a list of links to some of the most well know FLOSS business software wiki’s below but of course there are many more.
There is no shortage of open source wiki software and MediaWiki is the software used and developed for Wikipedia is open source under the GPL. Of the above wiki’s SugarCRM, Alfresco and Openbravo all use Wikimedia.