Invasion mod for native Quake
A mod I made for Quake for some mindless cooperative onslaught.
To use this, you need a custom map with the following entities and properties:
inv_controller wave_limit: How many waves to carry out
inv_spawn wave_N_monsterName: How many of monsters to spawn per wave. wave_0_zombie:10 will spawn 10 zombies the first wave for the given entity.