https://forums.alliedmods.net/showthread.php?t=205567 - This is the Zombie mod for CS:S / CS:GO.
Keep up the good work! i'm looking foward to remplace the old Zombie mod with this one! you could add some sounds when a zombie is about to respawn, like, "10, 9, 8, 7, 6, 5, 4, 3, 2, 1!" from CSO!