Open Source Monitoring System for performance and availability.
Enhanced Apache Server Status page - for one or multiple servers
Zenoss - Intelligent IT Operations Management
Enterprise-class, distributed monitoring solution for networks & apps
Monitorix is a system monitoring tool
OPTOSS Next Gen Network Management System (NG-NetMS)
Open source tool to monitor your servers and websites
SSH Java client GUI for Unix, Linux administration and monitoring
SNMP adaptor for JMX.
MAG Server stands for Monitor And Graphing Server. [VM Appliance]
AlertOnFailure was inspired by XYmon, a Big Brother Compatible Monitor