For now, just some links
Installing in Linux was a problem he fixed … http://schweflinghaus.de/?p=355
Source code that is a continuation of the abandoned Version 3.7.1 below but this source code needs to be built … https://github.com/gerddie/ginkgocadx
Install Version 3.7.1 (2014-12-01) for Windows/Linux … http://ufpr.dl.sourceforge.net/project/ginkgocadx/3.7.1/
Wikipedia has nice introduction … https://en.wikipedia.org/wiki/Ginkgo_CADx