This file enable you to spawn zombies automatically in your zombie survival roleplay server or in sandbox, also there are more and different npcs to spawn. The zombie spawn points make only two zombies and when you kill those zombies appear two more in the same place and never finish unless you deleted the zombie spawn points. I will not take credit for it because It is based in one entitie make by Studentloon, thanks to Studentloon. Install in your addons folder into your garrysmod directory. Is not for garrysmod v9.

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http://forums.facepunchstudios.com/showthread.php?p=12019606