Flexiglass enables some of the missing features in Mac OS X window management
Flexiglass is a new application to make working with windows on a Mac more enjoyable. If you’re not satisfied with the current window management functionality, or if you're missing the facilities of Linux and Windows, then Flexiglass is what you need.
So, what does Flexiglass actually offer?
Flexiglass offers a more flexible way of moving and resizing windows. You can move or resize any window by holding down custom key and dragging the window anywhere you’d like.
There is a simple solution for working with multiple windows.
There are options to improve default behavior of standard Zoom and Close buttons.