I remember Ultrascience (though I remember Dr Gibbs as a separate company: perhaps they merged at some point). They sold 68K boards of their own that could run a great variety of operating systems, including d/os, Pick, OS-9 and most controversially AMOS (the Alpha Micro multi-user operating system), much to the ire of Alpha Microsystems. Only ever saw them in adverts; never seen one of their machines in the flesh.