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Windows IT Pro: Need a System Sentinel? Try JFFNMS
This free, open-source software turns a Windows system into a master system-monitoring console.
Infoworld: Stock your Windows administration toolkit for free
One fantastic place to start is with is JFFNMS, an open source network-monitoring solution.
PHP|Architect: Inside the 'Just For Fun Network Management System'
The creator of JFFNMS discusses how the program evolved, the challenges of building an NMS with PHP, and some useful hacks for beginners and advanced users alike.