Firmware

OpenFirmware
[html] Wikipedia OpenFirmware Article
[html] OpenFirmware Introduction
[html] OpenFirmware Quick Reference from FirmWorks
[html] OpenFirmware from OpenFirmware.info
[html] OpenBios from OpenFiemware.info
[html] OpenFirmware from One Laptop Per Child (OLPC) Initiative
[html] FORTH wiki from One Laptop Per Child (OLPC) Initiative
[html] OpenFirmware on Apple Macintosh PowerPC systems

Provisioning
[html] Razor - Bare Metal and Virtual Machine Provisioning API

iPXE
[html] Open Source Firmware - iPXE
[html] Overview of iPXE with SmartOS Support