Zombie Edition is a mod based on original half-life concept, but you will play as a headcrab and, what is more interesting, as a zombie. Zombies can mutate to change their characteristics into three types and every type will have at least six upgrades including new weapons and abilities. For further information please check this mod's Official Page.
So, as a Halloween Special, I've got released an open beta version of our mod. You are free to download it, share it, and find a bugs in it.