Zombie Mod Counter Strike Source
Read this! This is on the i3D 11 server. I don't play anymore, so i don't know if the server is still up. Yes, this is zombie mod. Just because they're alien skins, it doesn't change the fact the core gameplay revolves around infecting others and escaping the infected. The map is zm_atix_escape. There are a lot of versions of this map, so you'll have to search around; i'm not entirely certain what version this one is. It might be zm_atix_panic. Have a look for the zm_atix_panic_b3t map on Game Banana, or any other CS:S modding site.
Read this! This is on the i3D 11 server. I don't play anymore, so i don't know if the server is still up. Yes, this is zombie mod. Just because they're alien skins, it doesn't change the fact the core gameplay revolves around infecting others and escaping the infected. The map is zm_atix_escape. There are a lot of versions of this map, so you'll have to search around; i'm not entirely certain what version this one is. It might be zm_atix_panic. Have a look for the zm_atix_panic_b3t map on Game Banana, or any other CS:S modding site.