1. Linux：
Linux 是一组开源的类 Unix 操作系统，由 Linus Torvalds 开发。它是一个打包的 Linux 发行版。一些最常用的 Linux 发行版是 Debian、Fedora 和 Ubuntu。它基本上是用C语言和汇编语言编写的。 Linux 中使用的内核是 Monolithic 内核。 Linux 发行版的目标系统是云计算、嵌入式系统、移动设备、个人计算机、服务器、大型计算机和超级计算机。 Linux 的第一个版本于 1991 年推出。用于个人计算机的 Linux 的最新版本是 5.6(内核)。
2.蜻蜓BSD：
DragonFly BSD 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。
Linux 和 DragonFly BSD 的区别：
| LINUX | DRAGONFLY BSD |
|---|---|
| It was developed by Linus Torvalds. | It was developed by Matthew Dillon. |
| It was launched in 1991. | It was launched in 2003. |
| Its target systems are embedded systems, mobile devices, personal computers, servers, mainframe computers and supercomputers. | Its target system types are workstation, server, NAS and embedded systems. |
| Computer architectures supported by Linux are IA-32, x86-64, ARM, PowerPC and SPARC. | Computer architectures supported by DragonFlyBSD is x86-64. |
| Kernel used in Linux is Monolithic. | Its kernel type is Hybrid. |
| Its package management depends on the distribution. | Its package management is dports or pkg. |
| Its native APIs are LINUX/POSIX. | Its native APIs are BSD/POSIX. |
| It has the preferred license of GNU GPLv2 (kernel). | It has the preferred license of BSD. |
| Its update management depends on the distribution. | Its update management are git, cvsup, rsync and pkg. |
| The non-native APIs supported through its subsystems are Mono, Java, Win16 and Win32. | The non-native APIs supported through its subsystems are Mono, Java, Win16, Win32 and Linux. |
| File systems supported by Linux are ext2, ext3, ext4, btrfs, ReiserFS, FAT, ISO 9660, UDF and NFS. | File systems supported by DragonFlyBSD are UFS1, MFS, ext2, FAT, HAMMER and ISO 9660. |