I think Qt is a great choice to have a native look.
On Windows XP, widgets will be rendered with the Luna style (Windows XP default style).
On Vista/7, they will be rendered with the Aero theme.
On MacOS, they will be rendered with the Aqua theme.
On Linux, it's different.
Qt will use his own theme (Plastique style) or use your KDE theme (Oxygen theme for example).
If you prefer GNOME or XFCE (GTK), Qt can also use your GTK theme.
A Qt application can be perfectly integrated in Windows XP/Vista/7, MacOS, KDE, GNOME and XFCE desktops.
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