
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 | |
| OpenStep | Purchased
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. | |
| UnixWare | SCO's Unix |