An open source clone of Presentation Manager still jumps in my mind from time to time.
I wrote a draft idea (very high level) of a possibility on how to do a clone with Qt.
URL: http://www.os2world.com/wiki/index.php/Wild_Idea:_A_PM_clone_using_the_Qt_library
I'm not sure if it will be a good idea or not, or if it can be doable. But it is just a brainstorm draft.
