Download UnitZ UNET Free Unity. 

UNET Multiplayer Survival Game.

This project provided a useful template and tools to help you create your open-world multiplayer game in a few steps. the project includes difference enemies with optimized AI and difference functioning items like Gun, Sword, Grenade, Food and more you can also craft, hunt, or build your base and play around with your friends by driving a Car, This project also ready for a several shooting gameplay styles such as Team / Deathmatch, Co-op Survival Horror, Zombie Swarm, You can create your world, custom your rule and enjoy with your friends.