Psensor - Psensor is a graphical hardware temperature monitor for Linux.
arandr - ARandR is designed to provide a simple visual front end for XRandR.
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Glxinfo - glxinfo is a command-line tool that can help you diagnose problems with your 3D acceleration setup.
Hardinfo - Hardinfo is a system information and benchmark tool for Linux.
cpuid - cpuid dumps detailed information about the CPU(s) gathered from the CPUID instruction, and also...