1. 艾克斯：
AIX 是 IBM 提供的一系列专有操作系统。 AIX 代表高级交互式执行程序。最初它是为 IBM RT PC RISC 工作站设计的，后来它被用于各种硬件平台，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 网络服务器。它是通过 The Open Group 的 UNIX 03 标准认证的五个商业操作系统之一。 AIX 的第一个版本于 1986 年推出。AIX 的最新稳定版本是 7.2。
2. OpenBSD：
OpenBSD 是由 OpenBSD 项目提供的一个专注于安全的免费开源操作系统。它基于 Berkeley Software Distribution。它是一个类Unix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 年推出。这个操作系统中使用的内核是单片的。
AIX 和 OpenBSD 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. |