Community-based GPL-licensed network monitoring system
VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Pure Java Network Tools
Open Source Monitoring System for performance and availability.
Nagios Open Source network monitoring software - The Standard In ITM
CORBA Server Monitoring service
Enterprise-class, distributed monitoring solution for networks & apps
OPTOSS Next Gen Network Management System (NG-NetMS)
Open source tool to monitor your servers and websites
DOCSIS network management
A SNMP agent for Cacti
Various TCP/IP servers, clients and network management tools
Tools to help you control IT systems and escape their control over you
BGPHist stores MP-BGP updates activity and history into a database.
Modifications to Torrus
Bandwidth Monitoring Tool; Console SNMP traffic monitor