The CVSROOT for Xtheater is:
:pserver:anonymous@cvs.xtheater.sourceforge.net:/cvsroot/xtheater
So to access the latest sources:
cvs -d:pserver:anonymous@cvs.xtheater.sourceforge.net:/cvsroot/xtheater login
cvs -d:pserver:anonymous@cvs.xtheater.sourceforge.net:/cvsroot/xtheater co Xtheater
If you want to browse the CVS tree online, go
here