Glass2k - Small little program that allows Windows 2000/XP users to make any window transparent.
RBTray - Allows almost any program to be minimized to the system tray by right clicking its minimize button.
Peek Through - Title: Peek Through Description: Peek Through is an application for Windows XP, Vista and 7 which makes the foreground window transparent with the press of Hot Keys. You may adjust the amount of tr…
Stay On Top - Set a window to stay on top with this single-function but handy application.
Optimal Layout - Optimal Layout is a powerful Mac OS X application for managing your applications windows.
DeskPins - DeskPins can be used to make any application topmost, that is, to keep it above all other windows.