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.NetBSD：
NetBSD 是由 NetBSD 基金会提供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、台式机、手持设备和嵌入式系统。 NetBSD 项目侧重于跨许多计算机体系结构的精心设计、代码清晰度和可移植性。 NetBSD 的源代码是公开可用的，并获得许可。 NetBSD 的第一个版本于 1993 年推出，其内核类型是单片的。
AIX 和 NetBSD 的区别：
| AIX | NetBSD |
|---|---|
| It was developed and is owned by IBM. | It was developed and is owned by The NetBSD Foundation. |
| It was launched in 1986. | It was launched in 1993. |
| Its target system type is Server, NAS and workstation. | Its target system types are NAS, server, workstation and embedded systems. |
| Computer architectures supported are POWER, PowerPC-AS, PowerPC and Power ISA. | Computer architectures supported by NetBSD are IA-32, x86-64, ARM, MIPS, PowerPC and sparc64. |
| Kernel type is Monolithic with modules. | Its kernel type is Monolithic with modules. |
| The native APIs are SysV/POSIX. | Its native APIs are BSD-POSIX. |
| Preferred license is Proprietary. | It has the preferred license of BSD. |
| File systems supported are JFS, JFS2, ISO 9660, UDF, NFS, SMBFS and GPFS. | File systems supported by NetBSD are UFS, UFS2, ext2, FAT, ISO 9660, NFS and LFS. |
| The non-native APIs supported through its subsystems are DOS API, Win16, POSIX and .NET. | The non-native APIs supported through its subsystems are Linux and others. |
| Update management is Service Update Management Assistant (SUMA). | Its update management is by source or by binary. |