Shoregen is my Shorewall rule generator.  It's a way of maintaining multiple firewalls from a single set of rules.  The release linked below is my initial release made for Shorewall 2.x.  Soon i'll be putting the finishing touches on a version for Shorewall 3.2 which ties in nicely with shorewall-lite, but for now you'll have to get it from the Shorewall subversion repository.