QMForge is the direct descendent of PyMOlyze, which was inspired by the console-based, (originally) Windows-only program AOMix that has features including (and in addition to) those listed above. I initially wrote PyMOlyze in graduate school because I wanted a user-friendly (ie. graphical) Linux program to do MPA for each molecular orbital of Gaussian calculations.

QMForge was eventually extended it to handle files from geometry optimizations because I found myself wishing I could translate and rotate the optimized structure and save that as an XYZ file. During my Ph.D. program, I used QMForge for almost everything except making molecular orbital pictures and diagrams. Now that I've moved on, it is more a hobby project. It now handles frequency and excited state calculations.

QMForge is licensed under the GNU GPL. The source code can be found on the Sourceforge Project Page.

The GPL allows you to modify the program as you see fit, but if you distribute any of your changes (in binary or source form) you must state in any altered file when it was altered, provide the source code of your new version to anyone who requests it for a charge of no more than it costs you to send it to them, and license your work under the terms of the GNU GPL.

This applies to all of the code, so you also can't include portions of QMForge in your own work without making your work subject to the terms of the GPL. Even if you decide to distribute an unmodified version, the recipients have the right to the source code — either provide it to them or direct them to this website.