The OneJoker Project aspires to be a single source for all things in the intersection of computers and playing cards. It includes free code libraries in the Rust and Dart programming languages for handling cards and cards games. It includes free playing card images in many sizes and formats. And it includes articles about card games and programming.
Everything on this site is free software: not just free as in beer, but free as in freedom. You are free to use, modify, and distribute it in any way you like with no restrictions.