minerva-optics		- The ray-tracer, examples and tests. It has a README file in there.
AlgorithmRepository 	- Various numerical algorithms used by minerva-optics.
JavaOneLineUtils 	- Short utils used by minerva-optics.
minerva-optics-imse 	- Optics defs and analysis programs for AUG IMSE

All of that is here as directories but also in the minerva-optics.tar.gz

I would recommend using the Eclipse Java development environment.

The ray-tracer has no GUI but it is easy to output both SVG and VRML files.
For viewing VRML, I use Sergey Bozhenkov's 3D viewer 'wendel': https://bitbucket.org/sboz/wendel
For viewing SVG files Inkscape works well but struggles with very large line counts.

Please e-mail questions to minervaoptics[at]oliford[dot]co.uk