Here are some search engines and archive websites to get free, Unity3d-ready, resources.
- Universe/Charcaters
- Icons
- Pictures
- 3D Models
- Sound
- Music
- Softwares
Universe/Characters
Get free characters and stories from public domain (yes it’s old stuff, like more than 100 years ago) …don’t forget to check the list at the bottom of the page.
http://tvtropes.org/pmwiki/pmwiki.php/Main/PublicDomainCharacter
Icons
Use the white ones to be able to change their color in Unity3D.
http://www.iconsdb.com/white-icons/
Pictures
https://www.pexels.com/public-domain-images/
3D Models
UPDATE: there is Google’s low poly lib now!
Sounds
https://freesound.org/browse/tags/sound-effects/
https://mynoise.net/NoiseMachines/
Music
Use only “Commercial Use”.
http://freemusicarchive.org/search/
Softwares
To make the stuff you can’t found free!
- GameEngine: Unity3D
- Icon: InkSkape
- Pictures: Gimp, MagicaVoxel
- 3D Models: Blender
- Sound: Audacity
- Music: Reaper
Source
https://github.com/DamienFremont/blog/tree/master/20170927-indiegame-free-resources-and-materials