Mailing Lists
Use the gaupol-list mailing list for any usage or development discussion. gaupol-list is archived at least at Gna and The Mail Archive. To be kept informed on new releases and other major events, you can subscribe to the gaupol-announcements list. Traffic on the list should be very low.
Contributing
Bugs are filed in GNOME Bugzilla, under product "gaupol". Feature requests are filed as bugs with severity marked as "enhancement". If you're interested in translating, please read the "README.translators" file. See the subversion directory for a list of current translations.
If you're interested in coding, take a look at the source code and send email if you feel confident in helping out. There's a lot you can work on, see for example the "TODO" file and existing bug reports. API documentation is available online for the latest stable release. The API documentation also includes source code as colored HTML and offers a good starting point to familiarize oneself with the codebase.
Authors
Gaupol is written by Osmo Salomaa.