yacpi is described as 'Yacpi is an acpi monitoring program for Linux. It displays various acpi information like battery status and ac status on notebooks'. There are five alternatives to yacpi for Linux and Windows. The best alternative is hwinfo, which is both free and Open Source. Other great apps like yacpi are cpuid (Free, Open Source), Dmidecode (Free, Open Source), vbetool (Free, Open Source) and read-edid (Free, Open Source).
read-edid is a pair of tools (originally by John Fremlin) for reading the EDID from a monitor. It should work with most monitors made since 1996 (except for newer ones with 256-byte EDID's - WiP), assuming the video card supports the standard read commands (most do).