An advanced network simulator to design and configure virtual networks
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
Manage port forwardings via UPnP
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Xymon monitors your hosts, your network services, and everything else.
edit and replay captured network traffic
A Java based fault and performance management system
FreeBSD Multi PPP daemon
Components for IEC61375 standardised communication
Graphical network monitoring and documentation tool
Router distribution based on FreeBSD with FFRouting and Bird
Full-featured enterprise network management tool
AS2 1.1 server implementation in Java
free netflow analyzer
FlowViewer is a web-based netflow data analysis tool.