Port Map: easy UPnP port mapping
One of the nice things about the Airport Extreme Base Station is the Airport Utility application used to manage it. Most other routers these days are managed with a web interface which can sometimes be a little wonky. So it was with some interest that I discovered Port Map, from the Coding Monkeys of SubEthaEdit fame.
Port Map is not a full-fledged management application, but it does bring Cocoa lickability to one standard management task: port mapping, an essential task for iChat or Back to my Mac. If your router supports UPnP / NAT-PNP Port Map provides an iPhone-esque Ui for setting up specific ports, including "presets and URL templates." You can see it working above with my DD-WRT Linksys router (don't worry, I turned it off after the screenshot).
Port Map is a free download from The Coding Monkeys. They've also open-sourced some of the coding goodness that makes this possible and created a framework available to other developers on a Google Code page.