Zapper modifies the behaviour of the ZipWindow() function in intuition. Instead of resizing the
window to the alternate zoom values it will maximize the window full-screen (avoiding the titlebar if
there is one). It is also capable of smart-resizing the window (making it bigger) over the currently
available empty desktop/screen space (where there are no other windows).
The image to the left shows my ambient screen with a few opened windows on it.
To the right is the result (with smart-resizing) after pressing the zoom button on the leftmost
and rightmost windows.