Ich habe selbst schon einiges an Open-Source und CC Material ins Web gestellt und nutze auch selbst welches. Diese Seite listet die Materialien.
I myself published open-source code, helped translate projects and provided CC material. This list credits the works i used.
Useful Bookmarks on Freesounds: https://freesound.org/people/marokki/bookmarks/category/142402/
Audio
https://creativecommons.org/licenses/by/3.0/deed.de
http://creativecommons.org/publicdomain/zero/1.0/
https://freesound.org/people/guitarguy1985/sounds/57806/ by guitarguy1985
https://freesound.org/people/Benboncan/sounds/73581/ by Benboncan and his great neighbour :)
https://freesound.org/people/DWOBoyle/sounds/144258/ by DWOBoyle
https://freesound.org/people/stib/sounds/55001/ by stib
https://freesound.org/people/Posontic/sounds/429677/ by Posontic
https://freesound.org/people/NenadSimic/sounds/150879/ by NenadSimic
https://freesound.org/people/propthis/sounds/24731/ by propthis
https://freesound.org/people/Racche/sounds/160907/ by Racche
https://freesound.org/people/Halleck/sounds/29938/ by Halleck
https://freesound.org/people/richienoodles/sounds/178555/ by richienoodles
https://freesound.org/people/marokki/sounds/362354/ by marokki
https://freesound.org/people/marokki/sounds/362355/ by marokki
https://freesound.org/people/marokki/sounds/569679/ by marokki
https://freesound.org/people/TasmanianPower/sounds/162493/ by TasmanianPower