Twiki.org
Mindtouch.com
Xwiki.org
Xwiki.com
Openplans.org
Pbwiki.com
Wiki.org
Wikispaces.com
Wetpaint.com
Wikidot.com
Pbworks.com
Centraldesktop.com
Wikitree.com
Wikihost.org
Springnote.com
Editme.com
Socialtext.net
Citizendium.org
Openwetware.org
Socialtext.com
Connexions.org
Wikiindex.org
Bluekiwi-software.com
Bloki.com
Thoughtfarmer.com
Etouch.net
Kstoolkit.org
Atlassian.com
Openstreetmap.org
Dokuwiki.org
Pmwiki.org
Openwiki.com
Softwaregarden.com
Jspwiki.org
Opencircuits.com
Nuxeo.com
Tine20.org
Mediawiki.org
Swik.net
Edgewall.org
Splitbrain.org
Kwiki.org
Adaptavist.com
Zim-wiki.org
Alfresco.com
Liferay.com
Question2answer.org
Egroupware.org
Group-office.com
Sakaiproject.org