"One of the best uses for Linux is special-purpose, tightly
managed distributions for a single purpose, and Untangle has
created one of the most impressive applications of this principle.
The Untangle Gateway bundles together a list of applications that
even seasoned sysadmins couldn't install and effectively manage in
a timely manner. We've been playing with the Untangle Network
Gateway for a few months, and we must say: 'well done.'
"As the official name indicates, The Open Source Network
Gateway, is open source. As with most commercial open source
offerings, you must buy the Professional Package to get some
features, but surprisingly few. All of the core functionality is
included in the OSS version; enterprise management goodies augment
the product for the Professional Package offering..."