Sources: currently partly on GitHub, partly on https://bioproj.extra.cea.fr/ using Subversion.
Developing and releasing toolboxes binary-compatible with core BrainVISA binary distributions: casa-distro
Downloading sources and building all the projects is handled by brainvisa-cmake, more precisely via the command bv_maker and a configuration file.
Make sure to read the Contributor’s guide if you intend to contribute.