Named Game of the Year by over 50 publications, Valve's début title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies around the world.
This is npc models from half-life residual point and half life residual life mods and its now able to be used in mods and half life and its expansion packs, have fun , enjoy :D