All software projects concerning direct desktop hardware interaction are covered within the Hardware channel.
Coreboot, formerly known as LinuxBIOS, provides a modern BIOS/firmware implementation for many modern processors and chipsets.
Flashrom is an open-source utility for flashing flash chips and carrying out related tasks. Flashrom supports many different motherboards and other ASICs for flashing BIOS, EFI, Coreboot, Firmware, and other ROM images.
Gummiboot is a simple open-source UEFI boot manager.