Many of these things come out of the box on a Linux distro : Always on top, color picker, File explorer add-ons, keyboard manager, "mouse utilities" and "the Powertoys run" (a poor imitation of krunner could do)
Poor is exactly what it is. The converter is so broken, that a space in the wrong place will cause it to not work. IIRC something like 5m to ft works but not 5 m to ft