about that, i specified above that i would be working on the QT framework. And as QT framework is cross-platform it would work on mac, linux, and windows.
http://en.wikipedia.org/wiki/Qt_%28framework%29#Varieties

although it supports mobile devices as well, i would be concentrating on linux(ubuntu), then windows and then finally mac. In doing this i would have to make sure that i refrain from using OS dependant libraries and make use of cross-platform libraries, so that it would be easier to port from linux to windows and mac!