1. 艾克斯：
它是由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.蜻蜓BSD：
它是由 Matthew Dillon 开发的免费开源操作系统。它是一个类 Unix 操作系统，其设计灵感来自 FreeBSD 操作系统。基本不用于个人电脑。它专为服务器、工作站、NAS 和嵌入式系统而设计。主要使用的编程语言是C语言。 DragonFly BSD 的第一个版本于 2003 年推出。 DragonFly BSD 的最新稳定版本是 5.6.1。它具有混合内核。
AIX 和 DragonFly BSD 的区别：
| AIX | DragonFly BSD |
|---|---|
| It was developed and is owned by IBM. | It was developed by Matthew Dillon. |
| It was launched in 1986. | It was launched in 2003. |
| Its target system type is Server, NAS and workstation. | Its target system type is workstation, server, NAS and embedded systems. |
| Computer architectures supported are POWER, PowerPC-AS, PowerPC and Power ISA. | Computer architectures supported is x86-64. |
| Kernel type is Monolithic with modules. | Kernel type is Hybrid. |
| Package management is installp and RPM. | Package management is dports or pkg. |
| The native APIs are SysV/POSIX. | The native APIs are BSD/POSIX. |
| Preferred license is Proprietary. | Preferred license is BSD. |
| Update management is Service Update Management Assistant (SUMA). | Update management are git, cvsup, rsync and pkg. |
| File systems supported are JFS, JFS2, ISO 9660, UDF, NFS, SMBFS and GPFS. | File systems supported are UFS1, MFS, ext2, FAT, HAMMER and ISO 9660. |