• Models: Vehicles, Buildings, Humanoids, Wildlife, Plants, Weapons, Untextured Models
• Textures: Asphalt/Concrete, Grass, Dirt/Mud, Snow, Stone, Sand, Other
• Sounds: Weapon, Animals, Ambient, Insect, Building, Vehicle, Other Sounds
• Premade Stuff: Heightmaps, Worlds

whatever it is your looking for, TUWR will probably have it. you just have to make a choice from the above links.