http://jffnms.sourceforge.net/

JFF NMS is a NMS (Network Management System) designed to mantain a IP SNMP / Syslog / Tacacs+ Network. I use it in a Cisco-based Network (Routers, Switches, etc) for my employer TIBA (Buenos Aires International Teleport) in Argentina.

Peep, the Network Auralizer, monitoring your network with sound. Peep is a network monitoring tool that represents network information via an audio interface. Network diagnostics are made not only based on single network events but whether the network sounds "normal".