Firewall log analyzer
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Open Source Monitoring System for performance and availability.
Nagios Open Source network monitoring software - The Standard In ITM
Enhanced Apache Server Status page - for one or multiple servers
Monitoring and reporting web gui for Bacula
Painel de Monitoramento em PHP/MySQL
Fritz!Box SmartHome Monitoring with PRTG and AHA-Interface
free netflow analyzer
Enterprise-class, distributed monitoring solution for networks & apps
Xplico is a Network Forensic Analysis Tool (NFAT)
PHP-based looking glass for Cisco, Juniper & Zebra/Quagga routers
OPTOSS Next Gen Network Management System (NG-NetMS)
REST interface and configuration GUI for Nagios
PotHead
Webinterface to (un)ban IPs in Fail2Ban
Open Source SIEM
Open source tool to monitor your servers and websites
Netflow visualisation and investigation tool
DOCSIS network management