"1. lshw with a GUI
lshw (Hardware Lister) is a small tool to provide detailed
information on the hardware configuration of the machine. It can
report exact memory configuration, firmware version, mainboard
configuration, CPU version and speed, cache configuration, bus
speed, etc. on DMI-capable x86 or EFI (IA-64) systems and on some
PowerPC machines (PowerMac G4 is known to work)."