Hostinfo is a utility for looking up hostnames and IPv4 addresses. Hostinfo uses the gethostbyname(3) and getaddrbyname(3) function calls, which means it tells you what your operating system really thinks rather than simply doing direct DNS lookups. Hostinfo provides options for both displaying and interpreting IP addresses in hexadecimal and backslash-octal notations as well as in the traditional base-10 dotted-quad notation.
Multidialnet is a curses-based tool that runs on a machine that hosts a shared dial-up Internet connection. This program will not only allow users to make the connection, but also log the usage and work out how much the phone call cost. It should work equally well with any sort of non-permanent connection - not just analogue modems.
The SINUS Firewall is a TCP/IP packet filter for Linux. Some of its features are stateful inspection of TCP communications, text-based configuration, graphical management interface for configuration of several firewalls, dynamic rules, prevention of packet and address spoofing, extensive logging, alerting, and counter intelligence.
Sound of Traffic is an application that converts TCP/IP header information into MIDI notes via the Java Synthesizer. Its purpose is to listen in on network traffic in ordered time via a tempo rather than in real-time, which could be more chaotic. In this sense it becomes closer to music then noise.