Zooom for Mac gives you additional options for moving and resizing windows, especially by clicking anywhere in the window. I've had multiple occasions where a change in display configuration, such as hooking up a projector, left a window with its top and bottom resize widgets off the screen. As far as I know, there is no solution for resizing the window in this situation, especially with apps that helpfully try to remember and reuse window positions. $19.95 shareware.