Monitorix is a free, open source, lightweight system monitoring tool
Open Source Monitoring System for performance and availability.
HTTP proxy to block ads and customize webpages
Main repository for munin master / node / plugins
Scalable, distributed monitoring system for high-performance computing
Various TCP/IP servers, clients and network management tools
Poll JMX attributes from Java based applications with Nagios
This tool locks down Linux and UNIX systems.
A XMPP robot for Nagios(tm) notifications and interaction.
Recursive mapping/discovery of network devices via CDP/OSPF
Multithreaded Proxy Enumeration Utility
External script for Xymon server to query an ESXi