"This page shows some screenshots of Qt Designer on various
platforms. Qt Designer is our visual user interface design
tool. Technically, it is just another application written with
the Qt GUI Toolkit. It has no platform dependent code, all it does
is using Qt's crossplatform API. By doing so, it gains all the
impressive multiplatfom abilities shown in these screenshots. Qt
applications appear just like native applications, with native look
and feel, and native speed - on some platforms, even faster."