VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
A network security analysis and monitoring toolkit Linux distribution.
Nagios Open Source network monitoring software - The Standard In ITM
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
centralized syslog-ng monitoring frontend writen in php
Open source tool to monitor your servers and websites
The Simplest Multi-User Latency Monitoring Web App
MySQL Replication Monitor (written in PHP)
A SNMP agent for Cacti
Monitor windows servers (temperature, free space, backups)
opensource Virtual Appliance Factory
Tools to help you control IT systems and escape their control over you
Is your host up or down?
BGPHist stores MP-BGP updates activity and history into a database.
Kepler is a monitoring system for HPC clusters
Arduino-controlled thermostat and sensors management