Models

Blender Model Repository: New version online since Novermber 2006.
The Low Poly Cooperative: Free models, mainly in Blender format, but also available as OGRE meshes.
WikiWorlds: Free content models and game data.
Worldforge media repository: 5+Gb of GPL textures, meshes, sounds, music and artwork.
irishlostboy's models at ShareCG: Free models complete with normal and specular maps.
3D-Source Game Assets Free high-quality game assets(game-ready 3d models) with normal map and specular map, available in industry's most used formats (obj, ase, dae, ma, fbx).
Artist-3D Free 3D models: Free models in various formats, most of which can be imported into blender.

Sounds

FindSounds: A free site where you can search the Web for sound effects and musical instrument samples.
freesound: An educational website with lots of sounds (30,000) licensed under CC.
pdsounds.org: Public domain sounds

Image After: Has many great textures, including referance art
Mayang: A free texture resource with several categories.
Got3D: Textures and reference art.
Textures: A seamless texture resource.
David Gurrea's Handdrawn Textures: Free for non commercial use.
Photorealistic Textures Pack: 2000 seamless realistic textures specifically designed for mapping and professional 3D modeling.
The Blender Texture Disc: A collection of high quality textures and materials, released to public domain in May 2006.
The world's most comprehensive list of free texture resources. ThinkFree | Scribd mirror: All sites are online as of October 2007

Information	Version
Wed 03 of May, 2017 21:12 GMT-0000 spacegaier Removed link pointing to exploit kit/malware	26
Thu 20 of Aug, 2015 08:45 GMT-0000 yobi3d	25
Wed 27 of Aug, 2014 15:07 GMT-0000 skogler	24
Thu 30 of Aug, 2012 13:25 GMT-0000 duststorm	23
Thu 07 of Jun, 2012 02:24 GMT-0000 qubodup removed double sharecg link, removed dead link	22
Thu 07 of Jun, 2012 02:21 GMT-0000 qubodup rm deadlinks, fixed oga links	21
Thu 07 of Jun, 2012 02:20 GMT-0000 qubodup added OGA, clarified cc licenses, removed questionable license-findsounds, updated texture cd link, removed dead links	20
Tue 13 of Mar, 2012 13:02 GMT-0000 noorus Updated freesound's entry	19
Tue 13 of Mar, 2012 11:14 GMT-0000 uakozak Link is offine	18
Tue 13 of Mar, 2012 11:10 GMT-0000 uakozak	17
Mon 12 of Mar, 2012 15:29 GMT-0000 brunobg Marked one of the links as offline.	16
Wed 18 of Jan, 2012 09:44 GMT-0000 coaljoe	15
Fri 14 of Oct, 2011 13:35 GMT-0000 duststorm	14
Fri 14 of Oct, 2011 00:09 GMT-0000 duststorm	13
Sun 31 of Jul, 2011 23:24 GMT-0000 jacmoe	12
Tue 19 of Oct, 2010 15:35 GMT-0000 squareroot the huge list is gone, too many dead links	11
Fri 20 of Aug, 2010 19:38 GMT-0000 duststorm	10
Wed 30 of Jun, 2010 01:26 GMT-0000 JustBoo	9
Mon 21 of Jun, 2010 15:24 GMT-0000 OviOvinet	8
Mon 21 of Jun, 2010 15:24 GMT-0000 OviOvinet	7
Mon 21 of Jun, 2010 15:24 GMT-0000 OviOvinet	6
Thu 13 of May, 2010 22:35 GMT-0000 jacmoe	5
Thu 31 of Dec, 2009 06:22 GMT-0000 jacmoe	4
Thu 31 of Dec, 2009 06:21 GMT-0000 jacmoe	3
Thu 31 of Dec, 2009 06:20 GMT-0000 jacmoe	2