Always on Top - Keep Any Window Visible Always.
Stay On Top - Set a window to stay on top with this single-function but handy application.
TurboTop - Keeps your windows "Always on Top"
PinWin - Download PinWin - Pin On Top for free. Pin any window to be always on top of the screen. PinWin is a minimal Windows system tray application that allows you to pin any windows to the top of the screen with one click.
SmartSystemMenu - SmartSystemMenu extends system menu of all windows in the system
DeskPins - DeskPins can be used to make any application topmost, that is, to keep it above all other windows.