Probably this will be interesting to you too:

GLUI:
http://www.cs.unc.edu/~rademach/glui/

<quote>
GLUI is a GLUT-based C++ user interface library which provides controls such
as buttons, checkboxes, radio buttons, and spinners to OpenGL applications.
It is window-system independent, relying on GLUT to handle all
system-dependent issues, such as window and mouse management. Features of
the GLUI User Interface Library include
</quote>