Any project that runs on a computer (not a microcontroller) that doesn't need a hardware accelerated multimedia. But even if the later you can always use sdl2.

My last three perl projects (not counting throwaway minor scripts): The control interface of a galvanic vestibular stimulator for VR motion sickness. A GUI for doing the required quirky edits to text files for text to speech smoothness. A comment system for a static website.