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)
Monitor windows servers (temperature, free space, backups)
A SNMP agent for Cacti
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