NIXStats - SaaS monitoring tool for window/linux servers and websites. Think up-time robot but with more features.
Anturis - Anturis offers hosted server monitoring software (SaaS) for both Windows and Linux.
Server Monitoring - A server monitor is a tool that monitors your server and website on close intervals and reports to you if it's inaccessible.
LepideAuditor for Active Directory - LepideAuditor for Active Directory is said to be the must-have part of the IT environment and IT administration purpose.
Nodeping - NodePing Server Monitoring and Web Site Monitoring. Simple but powerful Internet service monitoring.
Crowd Vox - Crowd Vox is a secured, robust, fully configurable, and customizable review script that helps you to create feature-rich business directories.