PortMapper is described as '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 address of an incoming connection request?'. There are six alternatives to PortMapper for Windows, Linux, Mac and BSD. The best alternative is MiniUPnP, which is both free and Open Source. Other great apps like PortMapper are Portfwd (Free, Open Source), AUTAPF (Freemium), Komodia Relay (Free, Open Source) and Port Map (Free, Open Source).
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. -- Forwarding of UDP datagrams.
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. Supports real-time, scriptable IP filtering.
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!
Connects to UPnP-enabled gateways and redirects ports. Command line tool and a Rust library. Tested on Zhone Access Point with 2014 firmware (it cannot list opened ports, so I did not try to implement such feature).