Xplico is a Network Forensic Analysis Tool (NFAT)
OPTOSS Next Gen Network Management System (NG-NetMS)
REST interface and configuration GUI for Nagios
Open source tool to monitor your servers and websites
PotHead
Netflow visualisation and investigation tool
A simple cacti viewer for smartphones
Weblooker monitors serveral services on multiple systems for their sta
Detect Flooder IPs, Reduce Attack Surface against HTTP Flood Attacks