VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Nagios network monitoring software is enterprise server monitoring
Fritz!Box SmartHome Monitoring with PRTG and AHA-Interface
The professional way to manage your WiFi network using FreeRADIUS
Enterprise-class, distributed monitoring solution for networks & apps
Open source tool to monitor your servers and websites
The Simplest Multi-User Latency Monitoring Web App
A SNMP agent for Cacti
Tools to help you control IT systems and escape their control over you
Is your host up or down?
MAG Server stands for Monitor And Graphing Server. [VM Appliance]
AlertOnFailure was inspired by XYmon, a Big Brother Compatible Monitor