Post your favorite appliances or "all-in-one" programs. Whether it runs in a virtual machine, or on its own hardware, it all goes.

My submission is Untangle. It's an open source network gateway (their term). Essentially, it can run a plethora of things that you may otherwise end up buying another appliance for:

• Web filtering
• logging
• mail spam filtering
• phishing monitor
• spyware blocking
• VPN

You name it, it's all there. Best of all, it's mostly free. A few appliances have annual costs due to inherent licensing or subscription costs. If you are looking for a new network perimeter device, definitely check it out.

The underlying OS doesn't matter, because it's the application we want to praise, not the OS beneath it.