NitrOS-9
NitrOS-9 was primarily a creation of three Canadians: Bill Noble, Wes Gayle and Curtis Boyle. It started out as an enhanced version of OS-9 Level Two for the Color Computer 3, incorporating then-newly discovered 6309 instructions to enhance performance.
Alan DeKok further enhanced NitrOS-9.
Through the work of Alan and Boisy Pitre, NitrOS-9 was "re-released" as an open source project in 2003. It now supports all Color Computers, including the Dragon 64.