OpenSMART, the Open (System|Source) Monitoring And Reporting Tool, is a Open Source System Monitoring Software to monitor problems on your servers and to report some important data about your servers. It is somehow similar to Tivoli or OpenView.
VooDoo cIRCle is modular IRC bot, scriptable thanks to PHP and Perl, with built-in SSL support, File System, private BotNet and advanced security rights for each user. Runs on POSIX/Unices, Windows and Mac OS X.
This Nagios plugin allows to remotely monitor Windows hosts in a AGENTLESS fashion. Technically it is using the Win32 API from a Windows proxy server to the remote host. Syntax and feature wise it mirrors NSClient++ (CPU, RAM, Disk, Svc, Proc., etc)
The Web.Developer Server Suite is a Windows-based Platform for the development, testing and deployment of PHP and MySQL websites and applications. Simplify development cycles with a consistent, standardized set of tools. Windows | Apache | PHP | MySQL