Coherent
Coherent was a 'clean room' clone of Unix v7, originally written for the PDP-11 in 1980. It was ported to run on the IBM PC in 1983 and to the Zilog Z8000-based Commodore 900 in 1985. Coherent was somewhat famous for being audited by Bell Labs and was vetted to be free of AT&T code. Despite its low price it failed to achieve any significant market share.
A review from 1991 can be found here
Coherent has been recently opensourced, under a 3-clause BSD license.
More information about the source code to Coherent can be found at www.nesssoftware.com.
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