netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Scapy - Scapy is a powerful interactive packet manipulation program.
PortMapper - Do you need to map a specific TCP or UDP port on your machine to another port on another machine?
Winsock Packet Editor - WPE Pro is a packet editor.
Simple Port Forwarding - Simple Port Forwarding works with WebPages and not directly with your router.
packeth - packeth is GUI and CLI packet generator tool for ethernet.