Wiremaps is an application that gathers layer 2 wiring information on a network using protocols like LLDP, EDP, CDP, and SONMP. It also gathers information from the FDB (MAC-port table on switches), the ARP table (MAC-IP table), and some miscellaneous information like interface names.
Pkviz is a tool for plotting and cycling through and animating a series of network packets captured by tcpdump. What makes it unique is that the packets’ structure is visualized, not any labels and not time itself. Pkviz takes each byte in a packet and plots it out end-to-end, left-to-right, from the first byte to the last. How high the dot gets plotted depends on the value of the byte: bytes with a value of 0 are at the bottom and those which are 255 (0xff) – the maximum value of a byte – get plotted at the top. This might not be interesting for one packet, but that changes when you start looking at thousands of packets. Pkviz can cycle through thousands of packets in the set so you can see what happened on the wire.
Serial TUN/TAP Encapsulation (Stuntapen) is a simple program that implements a SLIP (RFC 1055)-like algorithm, extended to allow either IPv6 packets (when using a TUN device) or Ethernet frames (when using TAP) to be transferred over some kind of a serial line, such as a computer's serial port, a TCP stream, or an SSH session. When used together with Netcat or SSH, it could be used to create a crude but working IP tunnel or VPN, or to forward IP traffic to a low-feature embedded system via a serial line or USB, or for educational purposes.