Udev Discover - A helping tool for udev testers, coders, hackers and consumers.
SYS Informer - Computer diagnostics, hardware monitoring, network audit, and benchmarking.
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
Mactracker - Mactracker provides detailed information on every Apple Macintosh computer ever made, including...
HeavyLoad - The individual test methods employed by HeavyLoad can be customized to fit your needs.
GtkStressTesting - GtkStressTesting or GST is a system utility designed to test and monitor various hardware components.