AT&T UNIX Systems & descendants
Each of the systems in this list is evolved from the version before, with Unix System III evolving from both the UNIX Time-Sharing System v7 and the descendants of the UNIX Time-Sharing System v6.
- Unix System III (1981)
- Unix System IV (1982)
- Unix System V (1983)
- Unix System V Release 2 (1984)
- Unix System V Release 3.0 (1986)
- Unix System V Release 3.2 (1987)
- Unix System V Release 4 (1988)
- Unix System V Release 4.2 (1992)
- UnixWare 1.1 (1993)
- UnixWare 1.1.1 (1994)
- UnixWare 2.0 (1995)
- UnixWare 2.1 (1996)
- UnixWare 2.1.2 (1996)
- UnixWare 7 (1998)
- UnixWare 7.0.1 (1998)
- UnixWare 7.1 (1999)
- UnixWare 7.1.1 (1999)
- UnixWare NSC 7.1+IP (2000)
- UnixWare NSC 7.1+LKP (2000)
- UnixWare NSC 7.1DCFS (2000)
- Open Unix 8 (2001)
- Open Unix 8MP1 (2001)
- Open Unix 8MP2 (2001)
- Open Unix 8MP3 (2002)
- Open Unix 8MP4 (2002)
- SCO UnixWare 7.1.3 (2002)
- SCO UnixWare 7.1.3 Update Pack 1 (2003)
