Below is a list of free, open access assets you can use during the jam if you wish to do so. 

textures: Hundreds of 3D Texture Downloads - Free PBR Materials 

Audios and Soundeffects: GDC Game Audio Bundles - SONNISS - 

Music: https://pixabay.com/music/ 

Game Art :https://opengameart.org/ 

Game Assets: https://www.kenney.nl/assets 

Game Assets: https://www.kenney.nl/assets (edited)