_(NitrOS-9 | http://www.striker.ottawa.on.ca/~nitros9/) is basically a reconstruction of _(OS-9) for the 6809 Tandy CoCo3, but refined for the Hitachi 6309 compatible CPU. Development group is pretty small, 'cause the hardware is pretty rare these days, but it is a fascinatingly loyal bunch of dedicated *(OS) hackers.