I think that spotify in windows looks very nice, obviously not native gui windows.
It seems to be absolutely unlimited with a metal look.
I was wondering which libraries they used to create such a nice application?
Is it possible to create a beautiful cross-platform application (well, both poppy and windows really)?
The user interface is completely written inside, although some components from the system (input text fields, menus, etc.). For Linux, these components come from QT4. QT4 is used only in Linux builds.
Spotify uses QT4 for him to create a single cross-platform interface.