SVN or Subversion is a version control system holding all revision of the source code of the project.
The source code is kindly hosted by the Elphel project on sourceforge.net
Browse SVN
View the source tree in a webview.
With a commandline SVN client you can check out the full code tree by typing:
svn co https://elphel.svn.sourceforge.net/svnroot/elphel elphel
Alternatively you can use an SVN GUI like tortoisesvn.