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This is the Simple Fast Operating System project ("crystalos")
This project is hosted by SourceForge.net. The project team describes it as:
A small multitasking OS to run on 65C816 based systems. Features to include a GUI support for as much HW for the supported systems as possible and a system of system extensions for easy expandability of the OS. The initial Development is being done on the Apple IIgs, with plans to port to the Commodore 64 with a SuperCPU. Eventually there will be ports to other 8 and 16-bit CPUs beginning with the 6502, followed by the z80, 6800, 6809, 8086, PDP-11, and then the TMS9900. Once these are complete there will be 32-bit ports to the 680x0, ARM, MIPS, etc.
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