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. FreeBSD：
FreeBSD是FreeBSD项目提供的一个免费的开源操作系统。它是基于两个类似Unix的操作系统Berkeley Software Distribution(BSD)和Research Unix设计的。它与Linux操作系统非常相似。它是较早的著名操作系统之一，但是现在与其他操作系统相比，它的使用率有所降低。 FreeBSD的第一个版本于1993年发布。
macOS和FreeBSD之间的区别：
| S.No. | MACOS | FREEBSD |
|---|---|---|
| 1. | It was developed and is owned by Apple Incorporation. | It was developed and is owned by The FreeBSD Project. |
| 2. | It was launched in 2001. | It was launched in 1993. |
| 3. | It is specifically designed for Apple mac computers. | It is not designed for personal computers. |
| 4. | Its target system types are workstation, personal computers and embedded systems. | Its target system types are server, workstation, NAS and embedded systems. |
| 5. | 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 FreeBSD are IA-32, x86-64, ARM, MIPS and PowerPC. |
| 6. | Its kernel type is Hybrid with modules. | Its kernel type is Monolithic with modules. |
| 7. | Its package management is macOS installer. | Its package management is Port collections/packages. |
| 8. | Its update management is Software Update. | Its update management is by source or network binary update. |
| 9. | Its native APIs are Carbon, Cocoa, Java and BSD-POSIX. | Its native APIs are BSD/POSIX. |
| 10. | It has preferred license of Proprietary, APSL and GNU GPL. | It has preferred license of BSD. |
| 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 FreeBSD are UFS2, ZFS, ext2, ext3, FAT, ISO 9660, UDF and NFS. |
| 12. | 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. |