[input_sh]

Last time I checked, Creative Commons had their own search for things under their licenses. But now apparently that project got transferred to WordPress and is now named Openverse: https://wordpress.org/openverse/?referrer=creativecommons.or...

Anyways, I'd argue that's the most comprehensive database of CC-licensed works.

[an1sotropy]

Thanks for this.

Also, I just checked that flickr.com still allows you to filter their searches by license.