Ebtables has a sourceforge account and uses its CVS services. This CVS contains the latest userspace and kernel code along with other documents. For casual browsing, you can use the Web Interface.
To grab the latest sources, you can do the following:
cvs -d:pserver:anonymous@cvs.ebtables.sourceforge.net:/cvsroot/ebtables login
cvs -z3 -d:pserver:anonymous@cvs.ebtables.sourceforge.net:/cvsroot/ebtables co ebtables2