Moin - (python based on PikiPiki )(Maven use it)
http://moin.sourceforge.net/

Tavi - (php, mysql)
http://tavi.sourceforge.net/

UseModWiki
http://www.usemod.com/

coWiKi - (php5, mysql)
http://www.develnet.org/

Chiq_chaq - (Perl )
http://chiqchaq.sourceforge.net/

JSPWiki - (JSP)
http://www.jspwiki.org/Wiki.jsp

TWiki -
http://twiki.org/

一堆Wiki Engine....
不如到這邊看看吧...
http://c2.com/cgi/wiki?WikiEngines
http://wiki.newzilla.org/WiKi