Port Map and TCMPortMapper
http://www.codingmonkeys.de/portmap/index.html
Did you ever feel the urge to map your networking ports using your Airport Basestation or a UPNP router? Did you ever want your application to be reachable from the internet, even in a home networking setup? Don't despair anymore. Port Map and TCMPortMapper are here!
UPnP PortMapper Homepage
http://upnp-portmapper.sourceforge.net
The UPnP PortMapper is an easy to use program that manages the port mappings (port forwarding) of a UPnP enabled internet gateway device (router) in the local network. You can easily view, add and remove port mappings.