Open Resources

Textures

•  http://www.cgtextures.com Free textures.
•  http://wojtar-stock.deviantart.com/gallery/ Wojciech Sadlej has given us permission to create derivative works (textures) and liscence them under a GPL-compatible liscence.

Audio

•  http://www.musopen.com Public domain music.
•  http://www.freesound.org/index.php Creative Commons sounds.
•  http://opengameart.org/browse/audio
•  Free sound & music sources