The paper:

    Melozzi F, Woodman MM, Jirsa VK, Bernard C (2017) The Virtual
    Mouse Brain: A Computational Neuroinformatics Platform to Study
    Whole Mouse Brain Dynamics eNeuro
    
    discusses the open source project The Virtual Mouse Brain (TVMB)
which is available at github:

https://github.com/the-virtual-brain

and precompiled versions exist for PC, Mac, and linux here:

http://www.thevirtualbrain.org/tvb/zwei/brainsimulator-software