1. AIX：
AIX是IBM提供的一系列专有操作系统。 AIX代表Advanced Interactive eXecutive。最初，它是为IBM RT PC RISC工作站设计的，后来又用于各种硬件平台，例如IBM RS / 6000系列，基于PowerPC的系统，System-370大型机，PS-2个人计算机和Apple Network Server。它是五个具有The Open Group的UNIX 03标准认证的商业操作系统之一。 AIX的第一个版本于1986年发布。AIX的最新稳定版本是7.2。
2. OpenBSD：
OpenBSD是由The OpenBSD Project提供的，专注于安全性，免费和开源的操作系统。它基于Berkeley软件发行版。它是一个类似Unix的操作系统。它可用于许多平台，包括服务器，NAS，工作站和嵌入式系统。它基本上是使用C语言，汇编语言，Perl和Unix Shell编写的。 OpenBSD的第一个版本于1995年发布。此操作系统中使用的内核是单片的。
AIX和OpenBSD之间的区别：
| AIX | OpenBSD |
|---|---|
| It was developed and is owned by IBM. | It was developed and is owned by The OpenBSD Project. |
| It was launched in 1986. | It was launched in 1995. |
| Its target system type is Server, NAS and workstation. | Its target system types are server, NAS, workstation and embedded systems. |
| Computer architectures supported are POWER, PowerPC-AS, PowerPC and Power ISA. | Computer architectures supported by OpenBSD are IA-32, x86-64, SPARC, 68k, Alpha and VAX. |
| Kernel type is Monolithic with modules. | Its kernel type is Monolithic. |
| The native APIs are SysV/POSIX. | Its native APIs are BSD-POSIX. |
| Preferred license is Proprietary. | It has the preferred license of ISC. |
| Update management is Service Update Management Assistant (SUMA). | Its update management is by source or by binary. |
| File systems supported are JFS, JFS2, ISO 9660, UDF, NFS, SMBFS and GPFS. | File systems supported by OpenBSD are ffs, ext2, FAT, ISO 9660 and NFS. |
| The non-native APIs supported through its subsystems are DOS API, Win16, POSIX and .NET. | The non-native APIs are not supported through its subsystems. |