Natural Selection

Natural Selection is one of the best mods ever made for Half-Life. Marine vs. alien combat with a blend of real-time strategy elements.

System Requirements:

Minimum: 500 mhz processor, 96mb ram, 16mb video card, Windows 2000/XP, Mouse, Keyboard, Internet Connection
Recommended: 800 mhz processor, 128mb ram, 32mb+ video card, Windows 2000/XP, Mouse, Keyboard, Internet Connection

Official Website

Download Link

Steam Page