It's a Zombie-fest at ZombieShooters.com!
By Mia Blaisdell onIf you love online flash, horror, and shooter games, than this is a site you won't want to pass up. I ran across Zombieshooters.com awhile ago and saved it in my favorites folder right away. It has probably the best collection so far that I've found of free Zombie/horror/shooter combination flash games. Titles which include:* 13 Days in Hell
* All Hallows Eve
* Army of the Dead
* Autumn War
*Boxhead: The Zombie Wars
* Comatose
* CQC
* Dead Frontier : Night One
* De-Animator
* Died Hard
* Divine Intervention
* Endless Zombie Rampage
* Graveyard of Drunken Souls
* Hungry are the Dead
* Left 4k Dead
* Letum
* Marksmen
* Project Validus
* Ultimate Down
* Zombie Grinder 60000
* Zombie Horde 2
* Zombie survival : Special Mission
So as you can see, there are is a lot of blood and guts zombie gore to choose from! All games can be played with your mouse and / or keyboard and none of them require any money or you to download them to play. I however do not recommend this for the young ones, it is after all, zombie shooters with a horror theme and is gory and violent.

From that list you posted, I've played Dead Frontier: Night 1, Boxhead, Left 4k Dead, and Divine Intervention. I'll have to try that website to play the others. You should try Dead Frontier: Night 2 and 3 and The Last Stand 1 and 2. Those are really fun zombie shooters. Last Stand can get laggy though near the end, so be careful if you have a low end computer.
Wow, this reminds me of a silly game on adultswim.com called Meocenaries. You are basically a team of mercenary kittens who have to save their leader. No zombies though.