1. macOS：
macOS是Apple Incorporation提供的一系列专有图形操作系统。它以前被称为Mac OS X，后来被称为OSX。它是专门为Apple mac计算机设计的。它基于Unix操作系统。它是使用C，C++，Objective-C，汇编语言和Swift开发的。它是仅次于Windows的个人计算机中第二使用最多的操作系统。苹果于2001年发布了macOS的第一个版本。
2. DragonFlyBSD：
DragonFly BSD是由Matthew Dillon开发的免费开源操作系统。它是一个类似Unix的操作系统，其设计灵感来自FreeBSD操作系统。它基本上不用于个人计算机。它是专门为服务器，工作站，NAS和嵌入式系统设计的。主要使用的编程语言是C语言。 DragonFly BSD的第一个版本于2003年发布。它具有Hybrid内核。
macOS和DragonFlyBSD之间的区别：
| S.No. | MACOS | DRAGONFLYBSD |
|---|---|---|
| 1. | It was developed by Apple Incorporation. | It was developed by Matthew Dillon. |
| 2. | It was launched in 2001. | It was launched in 2003. |
| 3. | Its target system types are workstation, personal computers and embedded systems. | Its target system types are workstation, server, NAS and embedded systems. |
| 4. | Computer architectures supported by macOS are x86-64(10.4.7-present), IA-32(10.4.4-10.6.8) and PowerPC(10.0-10.5.8). | Computer architectures supported by DragonFlyBSD is x86-64. |
| 5. | Its kernel type is Hybrid with modules. | Its kernel type is Hybrid. |
| 6. | Its package management is macOS installer. | Its package management is dports or pkg. |
| 7. | Its update management is Software Update. | Its update management are git, cvsup, rsync and pkg. |
| 8. | Its native APIs are Carbon, Cocoa, Java and BSD-POSIX. | Its native APIs are BSD/POSIX. |
| 9. | It has the preferred license of Proprietary, APSL and GNU GPL. | It has the preferred license of BSD. |
| 10. | The non-native APIs supported by its subsystems are Toolbox, Win16 and Win32. | The non-native APIs supported by subsystems are Mono, Java, Win16, Win32 and Linux. |
| 11. | File systems supported by macOS are HFS+, APFS, HFS, UFS, AFP, ISO 9660, FAT, UDF, NFS, SMBFS, NTFS, FTP, WebDAV and ZFS. | File systems supported by DragonFlyBSD are UFS1, MFS, ext2, FAT, HAMMER and ISO 9660. |