At the moment the WakeUpManager is developed as a 'one man show'...
If you like the idea behind wum and want to contribute your ideas, new features, fixes (maybe there are some bugs somewhere?), ... just raise your hand on the wum mailinglist.
The development of wum is coordinated via git - the new source code management tool from Linus Torvalds himself.
The git repository can be browsed via gitweb
and can be copied on your local maschine via
git clone http://git.rfc2324.org/wum.git
(Beware that the Debian git-core package is missing a dependency to the curl package, which has to be installed when fetching git repositories via http)