Advanced IP Scanner - Advanced IP Scanner shows all network devices, gives you access to shared folders, and can even remotely switch computers off. Download it Free.

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

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.