CodeGen, Inc. - Makes SmartFirmware, a portable, easily customized ANSI C implementation of IEEE-1275 Open Firmware standard. Designed to be very easy and fast to port. Demonstration version download.
FirmWorks - O-F products, services, documentation, training. The industry champion and leading provider. Invented the technology, and lead development of the IEEE 1275-1994 standard. Field proven, written in Forth.
Open Firmware - Growing article, with links to many related topics. Wikipedia.
Open Firmware Working Group - O-F is processor and system independent boot code: firmware. Read about O-F, the Working Group; several related documents; several links to mirror sites, Forth, vendors, documentation, news, and proposals.
OpenBIOS - To be free, portable BIOS implementation, 100% IEEE 1275-1994. PCs have had BIOSes since the start. Since then, most have been DOS-specific, 16-bit, and real-mode, not something a modern OS such as Linux, BSD, or Hurd can use.
OpenFirmware.org - Brief description, links to software and system makers.