| OpenBSD | Free multi-platform 4.4BSD-based UNIX-like operating system with open source code which concentrates on security. |
| Partimage | Partition Image is a Linux/UNIX utility which saves partitions to an image file. |
| WINE | Open Source implementation of the Windows API for Linux and Unix. |
| FreeBSD | Operating system for x86 compatible ,amd64 compatible, Alpha/AXP, IA-64, PC-98 and UltraSPARC architectures. |
| FreeBSD Foundation | Platform supporting the FreeBSD operating system. |
| NoMachine NX | Terminal Server for Linux and Unix |
| OS Tutorials | Collection of tutorials for using and administrating Computer Operating Systems like Linux, Windows, DOS, OS2 or Mac OS. |
| UK Unix & OpenSystemsUserGroup | Non-profit organization and technical forum for theadvocacy of open systems, particularly Unix-like operating systems |