PiPer - A DIY Minecraft computer to build gadgets
DeskPins - DeskPins can be used to make any application topmost, that is, to keep it above all other windows.
Helium - Helium lets you accept payments by credit card for anything you want to sell online.
WindowTop - Easly set any window on top, just move the mouse to the top area of the window.
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
Skybn Window On Top - Window on Top can be used to make any application topmost,that is to keep it above all other windows.