Let's see, let's see.. let's see.. gametypes.
Coop games, Monsterhunt,Team deathmatch,Deathmatch, ctf, Jailbreak, Eavyhunter tournament, Assault, One flag ctf, Frenzy assault...
Oh yeah, and check the sticky thread on top of this page. It has tons of mods listed, and a link to a site where you can download them from.