Gyrus development takes place in the GNOME SVN Server. You can check out the latest code using the svn program like this:
$ svn co http://svn.gnome.org/svn/gyrus/trunk gyrus
We prefer to use GNOME Bugzilla to keep track of requests, patches, bugs, and features which are being worked on. Before submitting a bug report, please check it's not already reported.
A general overview of the current status of the project bugs can be found in the gyrus product page.
TranslatingJust as many other GNOME applications, gyrus is translated by the GNOME translation team.
DocumentationIf you want to write documentation for gyrus, you should join the GNOME Documenation team.
More information about getting involved with other GNOME apps (and many tips that apply to gyrus) can be found at http://live.gnome.org/JoinGnome