The Awful Lawton - It's like monkey bombs. You shoot the arrow and it attracts zombies by an eerie sound it gives off.

The Krauss Refibrillator - You shoot a downed teammate and instead of you reviving them it automatically revives them. You also carry the bowie knife after you buy it.

Porters X2 Raygun - The most powerful pistol like weapon. It can just mow through a massive horde of zombies.

The Zeus Cannon - A very powerful weapon. With one shot it can knock a whole group of zombies down. Only around round 20 do the zombies start to get back up.

AUG-50me - The AUG-50me has a pack-a-punched shotgun attachment which basically gives you a 3rd gun. This comes in handy later on in the game when you run out of ammo.