The Active Monitoring System
Monitorix is a free, open source, lightweight system monitoring tool
A network security analysis and monitoring toolkit Linux distribution.
Full-featured enterprise network management tool
Storage, SAN, LAN Performance Monitoring: IBM,NetApp,Hitachi,HPE,EMC
FlowViewer is a web-based netflow data analysis tool.
Main repository for munin master / node / plugins
This is now also available here github.com/sharkcz/collectl.git
Monitorix is a system monitoring tool
OPTOSS Next Gen Network Management System (NG-NetMS)
Netflow visualisation and investigation tool
Various TCP/IP servers, clients and network management tools
Real time monitoring : RPi-Monitor always keep an eye on your computer
Web based management tool for unixes
HTTP header aggregation tool
Continuous multi-platform multi host pinging tool.
Tool to monitor bandwidth utilization in Linux