zombie maps

So i was wondering if there are many maps that feature a continuous hoarde of zombies. I did some searching, and found noamzwf and zombiesurvival_b5. Zombiesurvival kept me and my friends interested for hours and was a nice change of pace. Oh, and also electriconslaughts always fun. Anyways, any other maps?

If it’s the HL2 zombies you mean, search on garrysmod.org for “onslaught” maps.

However, these kinda maps also feature other NPCs.