Not one per se, but I love when a piece of open source software absolutely destroys it’s competition. I’m not talking Firefox vs. Chrome or Unity vs. Godot debate (both are better, don’t @ me), I’m talking when it’s not even close, the open alternative is just industry standard.

VLC, Calibre, OBS and maybe Blender come to mind.

Technically you can have any username you would ever like, just spin up your own instance!