As part of my Tools collection, here is one that I find useful when working across multiple applications and I need to copy & paste data to a central area before orgamising it and pasting into Excel.
What this Addin does is to call up NotePad, gets its' Window handle, store this handle via a class module then perform some API routines to keep this window ONTOP.
See image below showing NotePad ONTOP of Internet Explorer BUT NOT active and still ONTOP of the Active Application.