An eye on your system
Light-weight system monitor for X
Open Source Monitoring System for performance and availability.
Nagios network monitoring software is enterprise server monitoring
Open source cross-platform Java Visual Traceroute
Manage and interpret IPMI systems with common a software tool
edit and replay captured network traffic
Graphical network monitoring and documentation tool
Components for IEC61375 standardised communication
AS2 1.1 server implementation in Java
A Java based fault and performance management system
Xymon monitors your hosts, your network services, and everything else.
Full-featured enterprise network management tool
The Free & Popular opendhcp application for Physical & Virtual Machine
FlowViewer is a web-based netflow data analysis tool.
free netflow analyzer
Pure Java Network Tools