The development of Tiki is done in a collaborative way by a friendly community of more than three hundred developers. Please see https://dev.tiki.org to participate
links below needed to be checked & migrated to dev.tiki.org
http://cia.navi.cx/stats/project/tikiwiki (a bot on #tikiwiki irc channel talks each commit that is done on cvs, and here is the page that stores the rankings. That other context is another game for motivation)
About the source code and development :
+ get more info on devel tools and servers on TikiServersNetwork