REST interface and configuration GUI for Nagios
PotHead
Open source tool to monitor your servers and websites
Manager Update Platform/Packages for pfSense Multisite
The Simplest Multi-User Latency Monitoring Web App
Scalable, distributed monitoring system for high-performance computing
single file multi-purpose multi-platform shell written in php
Simple remote host's ports scanner web app.
IOSec Addons are enhancements for web security and crawler detection
Easy to use web front-end for NAGIOS / ICINGA also CD installer
Detect Flooder IPs, Reduce Attack Surface against HTTP Flood Attacks