Unix Systems

|Research Unix |The versions of Unix developed at Bell Laboratories | |USL/USG |Systems developed by the Unix Support Group and the Unix System Laboratories | |Other Early Unixes |Modified versions of early Unix developed outside the Labs | |Early BSDs |The 16-bit BSDs from the University of California, written for the PDP-11 | |32-bit BSDs |The 32-bit BSDs for the VAX and other hardware architectures | |Commercial Unixes |Commercial versions of Unix sold by AT&T and other companies | |Unix Derivatives |Systems that are derived from Unix but no longer have any Unix source code |