How to get gpm?
You can browse the static archives or use git:
git clone git://git.schottelius.org/gpm
The archives are mirrored at ar.linux.it, the git repository is mirrored at github.
Support
There is the irc channel #gpm on irc.freenode.org.
The mailing list devoted to gpm is "gpm@lists.linux.it". In order to subscribe to the mailing list, visit lists.linux.it or send a message with "subscribe" in its body to gpm-request@lists.linux.it. For example:
echo subscribe | mail gpm-request@lists.linux.it
Or you can browse the mailing list archive.