This guide covers writing plugins for GNU MediaGoblin. It’s very much a work in progress partially because we just started writing it and partially because the plugin API is currently in flux.
There are a few ways—please pick whichever method is convenient for you!
Information about the bugtracker, IRC and the mailing list is all on the join page.
Patches are the most helpful, but even feedback on what you think could be improved and how to improve it is also helpful.