2020/07 update:
For js13kgames devs: collection of tiny sounds in mp3 (128kbps + 96kbps mono + 48kbps mono):
- Browse: https://github.com/xem/GameAudioBundleMP3/tree/gh-pages/js13k
- Download: https://xem.github.io/GameAudioBundleMP3/js13k/js13k.zip
compressed in MP3 @ 128kbps (~2.5GB!)
Sources (wav, 76GB!):
- 2018: https://sonniss.com/gameaudiogdc18/
- 2017: https://sonniss.com/gameaudiogdc2017/
- 2016: https://sonniss.com/gameaudiogdc2016/
- 2015: https://gamesounds.xyz/?dir=Sonniss.com%20-%20GDC%202015%20-%20Game%20Audio%20Bundle
Licence: (TL;DR do what you want) https://sonniss.com/gdc-bundle-license/