Overlayer
Window management utility for Windows; turn programs into overlays.
A lightweight window management utility to help get the most out of your limited screen area, by (safely) giving you the tools to: add transparency to a window, force a window to be topmost/appear on top of all others, as well as shortcut toggle-able click-through, or "ghost widows", if you like, where all clicks pass right through it as if it weren't there.
Sometimes you may only need one of these settings, but combining them together effectively allows you to turn any program into an overlay...