arandr - ARandR is designed to provide a simple visual front end for XRandR.
Open Hardware Monitor - Monitors temperature sensors, fan speeds, voltages, load and clock speeds, with optional graph.
driconf - DRIconf is a configuration applet for the Direct Rendering Infrastructure.
SpeedFan - Hardware monitor for Windows that can access digital temperature sensors located on several 2-wire SMBus Serial Bus. Can access voltages and fan speeds and control fan speeds. Includes technical articles and docs.
HWiNFO - Professional System Information and Diagnostics. Comprehensive Hardware Analysis, Monitoring and Reporting for Windows and DOS. FREEWARE. download. Advertisements.
cpuid - cpuid dumps detailed information about the CPU(s) gathered from the CPUID instruction, and also...