All below widget toolkits are cross platform and based on C/C++(from wikipedia):
CEGUI · Component Library for Cross Platform · dlib C++ Library · FLTK · FOX toolkit · OpenGL User Interface Library · GTK+ · IUP · Juce · Qt · Tk · TnFOX · Visual Component Framework · wxWidgets · YAAF · XForms · XVT
其中我们可以看到比较熟悉的FLTK,OpenGL,GTK+,Qt, wxWidgets等。和QT或者wxWidgets相比，非常轻量级的FLTK也具有很多优点。
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