Hi. Welcome to the Internet itch.io, have a look around,
Anything that brain of yours can think of can be found.
We have mountains of content, some better some worse.
And i will stop here before receiving a sue for copyright infrigement. XD
Have luck with your projects. If you are developing 3D games, in my profile you can find free models to use. All public domain.
(Yes, i am doing cheap marketing. Hope doesn't count as spam. The not edible SPAM i mean.) :-P