Portfwd

Portfwd, Port Forwarding Daemon, stands for port forwarding daemon.

MiniUPnP

miniupnp project homepage : a lightweight upnp client and daemon

Router is the best way to view & edit .GPX, .TCX, .KML, .LOC, Garmin (.FIT), and Pioneer (.DB) GPS route files on your Mac

socat is a relay for bidirectional data transfer between two independent data channels.