Flash player emulator
Appreciate that this is only likely to be useful to a small minority of you as it’s a bit of a niche use case, but I still think it worth including, as it was recently a real godsend for me.
Ruffle is a Flash Player emulator written in Rust and usable in the browser, on the desktop or via the command line.
If like me you have quite a bit of Flash work from years ago that was consigned to the bin when Adobe got rid of the player, this saves the day allowing you to playback and interact with those long forgotten projects.
Ruffle appeared in Issue 3 in the Useful section.