Boodler's version control is SVN, hosted by Sourceforge. See the SVN project page at Sourceforge for more information on using it. The repository is at
https://boodler.svn.sourceforge.net/svnroot/boodler/
The current development version is at https://boodler.svn.sourceforge.net/svnroot/boodler/core/trunk; official releases are listed under https://boodler.svn.sourceforge.net/svnroot/boodler/core/branch.
For a tar package of the source code, see the download page.