GUI interface

Hi there,

I am recently starting from total scratch on an OPENGL project and am wondering which GUI interface to use in Linux. My initial thought was Tcl/Tk or gtk but am not sure which or even if these are any good. If anybody has any experience or thoughts please let me have them. Feel free to include a comment as to my supidity if this seems a little basic but please still let me know what you think.

Thanks,

Rob D.