Windows: If you're a number pad ninja and dislike switching to your mouse hand to move windows around your desktop, WinLayout is the perfect utility for your system tray. It utilises your keyboard to move, resize and shuffle windows around.
The no-install and tiny utility offers a huge list of shortcuts, activated by holding the Windows, Ctrl, and/or Alt keys and tapping one of the number pad keys. WinLayout treats your desktop as a three-by-three grid, moving windows to the top left, bottom right, and the like when you tap the corresponding key. Hitting Win+7, for example, moves a window to the top left, while Win+3 sends it to the bottom right.
WinLayout is a free download for Windows systems. Want to give your number pad even more power? Try the previously mentioned application launcher ControlPad.