PortMapper

Do you need to map a specific TCP or UDP port on your machine to another port on another machine? Do you want to limit access to a server on your machine based on the IP...

Free Windows

Port Map

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.

Free Open Source Mac OS X

Portfwd

Portfwd, Port Forwarding Daemon, stands for port forwarding daemon. It's a small C++ utility which forwards incoming TCP connections and/or UDP packets to remote hosts. FEATURES -- Forwarding of TCP segments.

Free Open Source Windows Linux

AUTAPF

Reliable TCP and UDP port forwarding for Windows. Keeps the data flowing whenever the network is ready. Efficiently forwards many ports at once. Administer locally, or remotely using a Web browser.

Freemium Windows

Komodia Relay

This small utility performs either TCP/UDP/HTTP port forwarding from a source IP and port to another destination IP and port.

Free Open Source Windows

MiniUPnP

The MiniUPnP project offers software which supports the UPnP Internet Gateway Device (IGD) specifications. NAT-PMP and PCP support was added to MiniUPnPd.

Free Open Source Mac OS X Windows Linux BSD