window shade for OS X?? developers?

I am sure that everyone remembers the days of OS 9 when one could double click a window title bar to "roll up" the window, so that just the title bar appeared. At one point, this was a 3rd party addition to the OS, but then Apple took the hint and even added their own button to the title bar of every window to "shade" it.

I do not have a large screen, so I really miss this feature in OS X. Is there any FREEWARE (not shareware) options which work with OS X yet?

Are there any developers out there who would be up for this challenge? Is it possible?