Linux is the best-known and most-used open source operating system. It is open source as its source code is freely available. It is free to use.
A Linux distribution, often shortened to Linux distro, is an operating system compiled from components developed by various open source projects and programmers. Each distribution includes the Linux kernel (the foundation of the operating system), the GNU shell utilities (the terminal interface and commands), the X server (for a graphical desktop), the desktop environment, a package management system, an installer and other services.
1 Ubuntu
2 Debian
3 CentOS
4 Red Hat Enterprise Linux (RHEL)
5 Gentoo
6 Fedora
7 OpenSUSE
8 Scientific Linux
9 Cloud Linux
10 Elementary OS
11 Linux Mint
12 Arch Linux
13 Manjaro
14 Oracle Linux
15 Slackware
16 Mageia
17 Clear Linux
18 Rocky Linux
19 AlmaLinux