twiki, jotspot, phpwiki, mediawiki, xwiki compared. Mediawiki has pulled way out front since early 2005.
People (myself included) have always thought of JotSpot, Confluence and Socialtext as being the commercial wikis that generate the most buzz.
These pail into insignificance compared with the coverage of the twiki & mediawiki.
Mediawiki's use on wikipedia makes it the defacto php wiki. Shame for PhpWiki really:
http://google.com/trends?q=mediawiki%2C+phpwiki&ctab=1&geo=all&date=all
I took socialtext out of the comparison as Google does not have stats on it since Q3 2005. Their stats look wrong anyway so its best to simply not talk about them.
http://google.com/trends?q=socialtext%2C+jotspot&ctab=1&geo=all&date=all
Confluence as a term is too generic to reliably pull stats from, as it is also an English word. "Atlassian Confluence" returns fewer hits than it deserves.