1. Linux：
Linux是由Linus Torvalds开发的一组类似于Unix的开源操作系统。它是Linux发行版的打包。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。 1991年发布了第一个Linux版本。用于个人计算机的最新Linux版本是5.6(内核)。
2. DragonFly BSD：
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。DragonFlyBSD的最新稳定版本是5.6.1。它具有混合内核。
Linux和DragonFly BSD之间的区别：
| 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. |