Open Source Monitoring System for performance and availability.
Nagios Open Source network monitoring software - The Standard In ITM
Monitoring and reporting web gui for Bacula
free netflow analyzer
Xplico is a Network Forensic Analysis Tool (NFAT)
Visual Network Management System
Tools to help you control IT systems and escape their control over you
Is your host up or down?
A simple cacti viewer for smartphones
Monitoring your infrastructure for free.
project no longer maintained