I'm a Master's student working on a computational chemistry thesis. Up to this point, for all of my course work I've gotten away with using simple excell graphs for most of my diagrams or figures but now that I'm assembling my thesis I would like to have some nicer figures that look more journal quality.

Specifically I'm looking for help constructing Walsh Diagrams for comparing relative MO energies. Does anybody know of any good (preferably free) software packages or applications that make nice looking Walsh Diagrams?

I'm pretty sure any decent diagram construction program should do what I'm looking for, but like I said, I've really only used Excell up to this point so I'm really open to any suggestions.

Any help would be greatly appreciated!