[z303]

I'd have a look at the various demoscene sites.

https://www.pouet.net/

https://demozoo.org/

Lots of code on GitHub

https://github.com/search?q=demoscene&type=

The awesome demoscene list has some more pointers

https://github.com/psykon/awesome-demoscene

[caaaadr]

Thanks for mentioning the "demoscene" community! Had totally forgot that word and group but that's exactly up my alley