GLUT's menu system is rather rudimentary.

The Tcl/Tk system is, of course, a widely available full-featured menu system.

GLUT/Tk integrates these two very successful and portable systems: GLUT for portable 3D graphics, and Tcl/Tk for the development of sophisticated GUIs. Although both of these were originally developed under X windows and Unix, they now both offer a Windows version as well.

Please see http://www.nist.gov/gluttk/ for full details.