The source code is available via Subversion. Here are the commands to request a copy.
svn checkout svn://pureviolet.net/air/trunk/ganttpv ormlite
svn checkout svn://pureviolet.net/air/trunk/scripts Scripts
I use Python 2.7 in development, but it might work with an earlier version. It requires a recent version of wxPython.
I have received a report that there is an error when run under at least one version of Linux. The person who reported the error was not technical and was not able to identify exactly what was wrong or how to fix it. I have not been able to test this as I don't have a version of Linux available to me.
If you run into the same problem please let me know.
As a work around, because ORM-Lite shares source code with GanttPV, she was able to create ORM diagrams using GanttPV after running the "Object Role Modling -> Install ORM Diagram" script and then adding an ORM Diagram report.
I have tested ORM-Lite on the Macintosh. It has a problem displaying all of the help text, but otherwise seems to be working properly.
There are some developer hints that you might find useful on the GanttPV web site that also apply to ORM-Lite at http:/pureviolet.net/ganttpv/developer/subversion/