SeaBIOS is an open source implementation of a 16bit X86 BIOS. SeaBIOS can run in an emulator or it can run natively on X86 hardware with the use of coreboot.
SeaVGABIOS is a sub-project of SeaBIOS.
Please join the mailing list to contribute to SeaBIOS. Information on the internals of SeaBIOS is available on the [Developer Documentation](Developer Documentation) page.