monkey_man said:
on steam, zombie panic! source or Zombie panic Source, one of them is the good one. i can't remember
ZPS (officially Zombie Panic! Source) is a very good mod, but it's
kind of free. The mod itself is free and all, but you need a game with the current Source Engine, such as Half-Life 2.
But as for Source mods, here are the ones I love:
Multiplayer:
Zombie Master (Easily have sunk over 400 hours into this game)*
Firearms Source
Insurgency*
Garry's Mod (GMod 9 is free, GMod 10/11 is $10 on Steam)*
World War I Source
Dystopia*
Singleplayer:
SMOD series (Redux, Tactical, Outbreak) (Now most are implayable because of the May 26th update, but there's a MODDB download for a working SMOD)
Portal Prelude* (Portal, obviously, required)
*means a fucking brilliant mod