Network Firewall Linux Kernel Module with Conflict Resolution Engine
Open Source SIEM
Bandwidth monitor and rate estimator
A java packet sniffer and forger that wraps pcap libs.
The Simplest Multi-User Latency Monitoring Web App
Network link bonding/trunking/aggregation and multichannel VPN daemon
Displays network load on a graph
A SNMP agent for Cacti
Real time monitoring : RPi-Monitor always keep an eye on your computer
View, graph, record TCP segment retransmission rates
The Project moved to github https://github.com/EnFlexIT/AgentWorkbench
Build custom filter for your network based off of common communication
Open Source BGP Looking-glass
web front-end for vnstat
Stormons is a powerful SAN mapping and monitoring program