BGP and RPKI monitoring tool
A fancy self-hosted monitoring tool
A Java based fault and performance management system
Open Source Monitoring System for performance and availability.
System monitoring dashboard for terminal
Xplico is a Network Forensic Analysis Tool (NFAT)
Real time monitoring : RPi-Monitor always keep an eye on your computer
Fast CGI-based AsteriskPBX cluster administration tool.
Web based management tool for unixes
Monitor your network services and displays a DEFCon level