Another map in the God is Pfhorever series (currently includes Quicksilver, The Hand of God, and Solidaridad). Not too shabby.

Very large, and unfinished. Lots of places to explore, more fun stuff than before.

Comes as both a net level and a single level. (No clue why they've been separated.)

Lots of stairs. Good open spaces. Short on weapons.

If you like open spaces, get this map. 'Nuff said.

Big. Only works on PowerMacs.

Lots of corridors, no places to hide, no aliens. If you use the enclosed shapes patch, the walls have pictures of all the IRC #marathon folks. Way too many invisibility powerups (IMHO).

I hate the textures, but the level's pretty fun with three players. Look for the Spanker!

A large circling hallway system that goes around an "arena" like you've never seen before. Remeniscent of the tron disk fights, however this time you have more than a flimsy little frisbee!