Please visit the Milestone Snapshots section in our SourceForge File Release Area for links to all versions of Jamecs (and Janno), in both source and binary form.
You can also check out the source for the Jamecs bundle (not so useful, large) or just Janno (more useful, smaller). For the current snapshot:
cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/jamecs login cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/jamecs co -P module
Where module is one of jamecs or janno. The source code for Moxy is also hosted there, along with the standard modules and tools - see the moxy site for details of the modules. More details instructions for using CVS, including usage with the Maven SCM plugin, can be found on the CVS Usage page.