At least part of this work or collection is under a free, libre and open license.

Kenney

An artist and maker of game assets (2D and 3D)

http://www.kenney.nl/assets

Also hosted on Open Game Art. https://opengameart.org/users/kenney

Collection, Source

Licensing CC0 1.0 Universal (unclear) Each asset has a license listed; for the ones I checked, it was this one.

Grouping 3D Art, Art, Pixel Art

Funding Itch.io (sales)https://kenney.itch.io/kenney-game-assets, Patreon (ransom)https://www.patreon.com/kenney, IndieGoGohttps://www.indiegogo.com/projects/kenney-land-game-dev-learning-centre-in-limburg