WindowShade X 2.1.2
WindowShade X brings collapsible windows to OS X and adds punch, thanks to Aqua. Using WindowShade X, you can double-click on a window’s title bar to collapse the window (as in OS 9), or you can have the window turn semitransparent (based on a transparency level you set). You can also replace the minimize button’s behaviour with window-shading behaviour. If you use the semitransparent mode, you can even continue working in the window in its semi–see-through state.