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.
StableNet Express can comprehensively monitor an entire network, including the system and application environments. It features an easy-to-follow graphical display which provides a live view of what is going on in a networked IT system. The automatic discovery functions allow the entire monitoring system to be up-and-running within only a few minutes. Nothing needs to be installed on the production systems. It can be extended by users with their own measurement and alarm modules by adding scripts into a specific folder.
The Toby intrusion detection system is a fairly complete reimplementation of tripwire-1.3 (ASR) into Perl. It mainains a database of file properties to detect alterations to those properties. It supports MD5 and SHA-1 checksums of the file contents. It features a configuration file which is actually a Perl script, with the attendant power, flexibility, and difficulty.
Spoink is an output plugin for snort that works by blocking access to attackers using OpenBSD's pf API. Spoink uses a pf table and a blocking rule to stop "attackers" from accessing your system. To protect from false negatives you must have a whitelist full of IP addresses. It only blocks attacks defined in snort rules.
Dbeacon is a distributed multicast monitoring tool. The main purpose of a beacon is to monitor other beacons' reachability and to collect statistics such as loss, delay, and jitter between beacons. Dbeacon supports both IPv4 and IPv6 multicast and supports collecting information using both Any Source Multicast (ASM) and Source-Specific Multicast (SSM).
WMSServer is a PHP class that can be used to retrieve usage statistics of a Windows Media server. It uses a Windows COM object to connect to a Windows Media server, given a its host name and user name and password to retrieve the statistics. It can retrieve many types of statistics regarding the users connected to the Windows Media server, bandwidth usage, protocol type usage, etc.