The University of Lausanne's Blue Brain Project has a lot of source code up at Github to take a look at [1], including some kind of specialized neuron ray-tracing renderer. Not too sure which data sources it can use. For example, is (a part of) the 31.000 neuron rat brain available somewhere?

They also seem to have developed a window system intended for large touch screens [3] that they use for "all hands" meetings on their brain research [4].

[1] https://github.com/BlueBrain

[2] https://github.com/BlueBrain/Brayns/blob/master/doc/UserGuid...

[3] https://github.com/BlueBrain/Tide

[4] https://www.youtube.com/watch?v=wATHwvRFGz0