This is a more complete list and links to The OS Files (bold items), related UNIX publishers or organizations web sites. Versions for embedded applications and non-x86 platforms are not included.
|Darwin||BSD based open-source OS, used in Mac OS X.|
|FreeBSD||UNIX specifically for x86 platform, and a few others.|
|OS X||Apple Mac OS X - Workstation and Server|
|NetBSD||UNIX for many different CPU platforms including x86.|
|NextStep||Predecessor to OpenStep - No longer available. (Based in part on BSD 4.3)|
|OpenBSD||Small compact OS with high security|
by Apple, but no longer available or supported.
|SCO Open Server||SCO's Desktop and Server OS|
|Solaris||Advanced UNIX for Servers and Desktops from Sun Microsystems.|