Afaik Etherpad has been integrated into docuwiki and mediawiki, not sure about other CMS' -- We don't catalogue them all, perhaps that is something you could help us with?
https://groups.google.com/forum/?fromgroups=#!topic/tiddlywiki/4l9TPFiix4M
Has anyone successfully combined TiddlyWiki and EtherPad? That would be an awesome combo!