> I'd like to second Randy's comments, and add it'd be very nice if Avogadro can read and write the coordinates section. Everything else is
> relatively unimportant, in comparison.
The problem, sadly, is the incredible diversity of formatting people use with Gaussian input files. In addition to Cartesian, we'd have to support z-matrix (with variables), scanning geometric variables, bonding, etc.
I gave up. Particularly in the context of a GUI, it's very hard to handle. On a command-line, you could stop and complain bitterly about some wonky formatting, but people expect reading files in a GUI to "just work."
I'm willing to listen to arguments -- I certainly understand the utility. I'm just expecting there will be dozens of complaints of "bugs" with strange files.