When GPGnet died it took with it a searchable database of all the phenomenal community-created maps that have been created over the years--the GPG Vault. I had a rare stroke of efforts the other day and created a website that catalogs all the maps in terms of size, number of players, and so on along with links to one of the GPG Vault mirrors for downloads. The utility that created the data was more of a guess than a concrete, for-definite readout but I think it's 95 to 98 percent accurate. Anyway, here you go.
http://brackman.wswarren.com/
Hopefully this will help people find maps they want to play, especially those hard-to-find maps that have AI markers. Per a couple of disclamers on the site I'll try to go through and slowly verify data and fix any bugs that pop up in the site, but being an engineer I'm naturally pretty lazy and will get around to such things "eventually".
Enjoy