If you’re looking for free game graphics, this site is the first place you should visit. Originally created as a forum for game development enthusiasts, OpenGameArt features free textures, 3D models, music, and sound effects.
They have a search function that lets you filter by license, and there are over 3100 3D models available for download. You will also find 2D art on this site, along with source code for various mini-games. Finally, OpenGameArt is a great developer forum where you can learn new tips and tricks by using their message boards and tutorials.