PowerToys Run is fantastic as an app launcher. Not quite as good as Alfred on MacOS but then nothing is. There's a bunch of similar apps for Windows (I used to use Hain) but none ever worked quite right for me, PowerToys Run does though.

FancyZones is awfully nice too for just putting a window somewhere at a reasonable size and location.

As other folks have noted SysInternals is another similar rogue Windows product by Microsoft. Process Explorer from there is indispensible, as is Autoruns.