I use hyprland and can bind stuff through their config, whether that is some library functions or executing a script i wrote. I’m sure there are other ways to do similar with different desktop environments.

Liberapay might interest you. Not quite the same but maybe close enough

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It you’re looking for ideas-- Something you’re passionate about. Find a problem you’re having, fix it, and make it open source. That’s the best way to make sure whatever you do doesn’t get abandoned. Good luck