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Crystal Space	qeradiant	wxWindows	Qt	GLUI	V

V

V application on Windows

V file selection on X

features

Platform native widgets.
No themes; this is inherent to the platform native widgets.
Visual development environment (VIDE).
OpenGL integration.

platforms

MOTIF
Windows
GTK
Mac

pricing

That's simple, it is free and available under L-GPL (Library/Lesser General Public Licence), with an exception stating that derived works in binary form may be distributed on the user's own terms.