Open Source Monitoring System for performance and availability.
Nagios network monitoring software is enterprise server monitoring
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Firewall log analyzer
free netflow analyzer
Monitoring and reporting web gui for Bacula
Painel de Monitoramento em PHP/MySQL
Enhanced Apache Server Status page - for one or multiple servers
Zenoss - Intelligent IT Operations Management
Enterprise-class, distributed monitoring solution for networks & apps
Database monitoring agent for zabbix
PHP-based looking glass for Cisco, Juniper & Zebra/Quagga routers
OPTOSS Next Gen Network Management System (NG-NetMS)
inventory, asset management network monitoring and backup appliance
Track your ARP/MAC table changes and so much more
Open source tool to monitor your servers and websites
Open Source SIEM
Netflow visualisation and investigation tool
DOCSIS network management