The latest source package is available at SourceForge.
Snapshots are avaliable via SVN. The repository can be checked out through SVN with the following instruction set: svn co https://canpie.svn.sourceforge.net/svnroot/canpie canpie
svn co https://canpie.svn.sourceforge.net/svnroot/canpie canpie
The documentation is also available as PDF.