I manage, with two friends, a 32 player dedicated server for Garrys Mod
we run the "Stronghold" game mode
which is pure deathmatch, with in-game team forming, to create alliances as you fight. you can also build and defend forts. the real fun comes from the interplay between you and your team and everyone else when you create truces and then break those truces and go on an all out raid on another base.
kills earn you money, killing in a row without dying earns more money. this money buys all your ammo and weapons (none of which are free) you can rent a gun for one match or buy it so its there everytime your in the server. rounds are 60 minutes long to provide enough time for the rhythm to settle then shift into overdrive. this game is fast and slow paced all in one.
its all crazy fun, and it really makes you use your mind becuase you can use your available props to make a ladder in the sky or build a road to another base, even stack a bunch up and barricade yourself in. its all allowed. get creative with it!!!
we monitor the server constantly and play in it ourselves very often. since we are new, we are kind of unknown and desperately need more players!!!
new members at our website get 1k bonus cash to start buying new weapons in game. ask Noisy Boy in game about it.
server info is on the main page there.