Visualizing the results of molecular orbital calculations 1) MO program: gaussian, gamess, mopac, etc. 2) display molecule in 3D: geo-opt, single-point, nomal mode (animation) 3) density: contour plot or 3D view for electron density and MO coefficient Everything what you want about MO calculation can be seen. WWW: http://www.cmbi.kun.nl/~schaft/molden/molden.html You must set the environmental variable ether ORIGINALBINARY=yes or MYBINARY=yes. The latter will be used for building up your own binary, which is specially customized. web site, shown above. Acknowledgement: Porting to 4.0-CURRENT (__FreeBSD_version == 400005) and later versions have been assisted greatly by Glenn Johnson , thanks a lot ! -- rmiya