I am glad to report that Firewall Builder 4.0 has been released. This is a milestone release that comes with improved GUI, support for high availability firewall configurations with Linux, OpenBSD and PIX and many other new features. We have been testing it for several months in beta to make sure it is stable and ready for production use. "Stable" repositories of RPM and DEB package have been updated and serve v4.0.0 build 2877. This page explains how to use repositories: http://www.fwbuilder.org/4.0/docs/firewall_builder_packages.html. These packages, as well as source tar.gz archives, can also be downloaded from SourceForge
Thank you to everyone who helped with testing and provided bug reports and feedback.
Firewall Builder Project