SYS Informer - Computer diagnostics, hardware monitoring, network audit, and benchmarking.
ServerSuit - ServerSuit is a browser based program that enables remote Linux administration, monitoring, website hosting, and server setup automation.
Mactracker - Mactracker provides detailed information on every Apple Macintosh computer ever made, including...
RedGate SQL Monitor - SQL Monitor helps you and your team find issues – before they become problems
GtkStressTesting - GtkStressTesting or GST is a system utility designed to test and monitor various hardware components.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services