Simple Port Forwarding works with WebPages and not directly with your router. Making it a safe program to use. Its no different than using Firefox, IE or any other browser to setup port forwarding yourself.
socat is a relay for bidirectional data transfer between two independent data channels. Each of these data channels may be a file, pipe, device (serial line etc. or a pseudo terminal), a socket (UNIX, IP4, IP6 - raw, UDP, TCP), an SSL socket, proxy CONNECT connection, a file...
This is a Swiss Army knife of port forwarding. It transforms network traffic whichever way imaginable. The traffic for forwarding is selected by a combination of: direction (incoming/outgoing), protocol (TCP/UDP), Port, IP (IPv4, IPv6, DNS name), MAC, and Network Adapter.
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.