A complete OpenSource Network Management System Is SNMP-Standard Oriented (tested on Cisco and Linux). It Integrates Syslog, Tacacs, RRDtool (Performance Graphs), Maps, Traps, TFTP, Autodiscovery, Sound Alerts, AAA, Modular and Extensible.
IPFWstats is a suite of shell, perl and PHP scripts to count network traffic on
a per user basis on a server using the FreeBSD IPFW firewall. Statistics are imported into a MySQL database daily and can
then be viewed using a PHP script in a web browser
Shipton is designed to collect disk space usage statistics from network monitors, collate the data and calculate rates of disk growth etc. This data can then be used to provide projections as to when additional disk space etc is required.