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Mouse Grid helps you navigate your mouse by using the keyboard. (Useful for people with kinetic disabilities or the mouse haters)
Windows include something like that, but I think mine is faster than what Microsoft gives. You can select the part of the screen you want the mouse to jump by selecting a keypad number of the corresponding box in the grid. left click is keypad / or [ and right click is keypad * or ].
More info by pressing F1 after you run the program.
You can now change the width of the lines in the grid by placing and editing the MouseGrid.ini file (Right-click "Save Link As" or "Save Target As") in the same folder as MouseGrid.exe