1. openSUSE (4)
The openSUSE project is a community program sponsored by SUSE Linux and other companies. Promoting the use of Linux everywhere, this program provides free, easy access to openSUSE, a complete Linux distribution. The openSUSE project has three main goals: make openSUSE the easiest Linux for anyone to obtain and the most widely used Linux distribution; leverage open source collaboration to make openSUSE the world's most usable Linux distribution and desktop environment for new and experienced Linux users; dramatically simplify and open the development and packaging processes to make openSUSE the platform of choice for Linux developers and software vendors.

2. Arch Linux (10)
Arch Linux is an independently developed, i686- and x86_64-optimised Linux distribution targeted at competent Linux users. It uses 'pacman', its home-grown package manager, to provide updates to the latest software applications with full dependency tracking. Operating on a rolling release system, Arch can be installed from a CD image or via an FTP server. The default install provides a solid base that enables users to create a custom installation. In addition, the Arch Build System (ABS) provides a way to easily build new packages, modify the configuration of stock packages, and share these packages with other users via the Arch Linux user repository.

3. Ubuntu MATE (12)
Ubuntu MATE is a desktop Linux distribution which aims to bring the simplicity and elegance of the Ubuntu operating system through a classic, traditional desktop environment - the MATE desktop. MATE is the continuation of the GNOME 2 desktop environment which was used as Ubuntu's default desktop until 10.10 (when it was replaced by Unity). The project began its life as an Ubuntu "remix", but starting with version 15.04, it was formally accepted as an official member of the Ubuntu family of Linux distributions.

4. FreeBSD (22)
FreeBSD is a UNIX-like operating system for the i386, amd64, IA-64, arm, MIPS, powerpc, ppc64, PC-98 and UltraSPARC platforms based on U.C. Berkeley's "4.4BSD-Lite" release, with some "4.4BSD-Lite2" enhancements. It is also based indirectly on William Jolitz's port of U.C. Berkeley's "Net/2" to the i386, known as "386BSD", though very little of the 386BSD code remains. FreeBSD is used by companies, Internet Service Providers, researchers, computer professionals, students and home users all over the world in their work, education and recreation. FreeBSD comes with over 20,000 packages (pre-compiled software that is bundled for easy installation), covering a wide range of areas: from server software, databases and web servers, to desktop software, games, web browsers and business software - all free and easy to install.

5. Kali Linux (30)
Kali Linux (formerly known as BackTrack) is a Debian-based distribution with a collection of security and forensics tools. It features timely security updates, support for the ARM architecture, a choice of four popular desktop environments, and seamless upgrades to newer versions.

6. Bodhi Linux (35)
Bodhi Linux is an elegant and lightweight Ubuntu-based distribution featuring Moksha, an Enlightenment-17-based desktop environment. The project takes a decidedly minimalist approach by offering modularity, high levels of customisation, and choice of themes. In addition to basic 32- and 64-bit systems, Bodhi maintains designated ISO images for Chromebooks and legacy machines. By default Bodhi has only five pre-installed applications: Midori, Terminology, PCManFM, ePhoto, and ePad. Additional software is available via AppCenter, a web-based software installation tool.

7. OpenMandriva Lx (43)
The OpenMandriva distribution is a full-featured Linux desktop and server, sponsored by the OpenMandriva Association. It is based on ROSA, a Russian Linux distribution project which forked Mandriva Linux in 2012, incorporating many of Mandriva's original tools and utilities and adding in-house enhancements. The goal of OpenMandriva is to facilitate the creation, improvement, promotion and distribution of free and open-source software in general, and OpenMandriva projects in particular.

8. Alpine Linux (44)
Alpine Linux is a community developed operating system designed for x86 routers, firewalls, VPNs, VoIP boxes and servers. It was designed with security in mind; it has proactive security features like PaX and SSP that prevent security holes in the software to be exploited. The C library used is musl and the base tools are all in BusyBox. Those are normally found in embedded systems and are smaller than the tools found in GNU/Linux systems.

9. Sabayon (48)
Sabayon is a Gentoo-based distribution which follows the works-out-of-the-box philosophy, aiming to give the user a wide number of applications that are ready for use and a self-configured operating system. Sabayon offers the user an easy-to-use workspace with a captivating look, good hardware detection and a large number of up-to-date software packages installed by default, with additional software available from a repository. Sabayon is available in several flavors featuring respectively the KDE, GNOME and Xfce desktop environments.

10. Tiny Core Linux (50)
Tiny Core Linux is a 12 MB graphical Linux desktop. It is based on a recent Linux kernel, BusyBox, Tiny X, Fltk, and Flwm. The core runs entirely in memory and boots very quickly. The user has complete control over which applications and/or additional hardware to have supported, be it for a desktop, a nettop, an appliance or server; selectable from the project's online repository.

11. SolydXK (89)
SolydX and SolydK are Debian-based distributions with the Xfce and KDE desktops respectively. SolydXK aims to be simple to use, providing an environment that is both stable and secure. SolydXK is an open-source alternative for small businesses, non-profit organisations and home users. The project started as an unofficial variant of Linux Mint's "Debian" edition with KDE as the default desktop, but it was later given its own identity as SolydK. SolydX was added after Linux Mint dropped its Debian-based flavour that used the Xfce desktop.

12. SliTaz GNU/Linux (94)
SliTaz GNU/Linux is a mini distribution and live CD designed to run speedily on hardware with 256 MB of RAM. SliTaz uses BusyBox, a recent Linux kernel and GNU software. It boots with Syslinux and provides more than 200 Linux commands, the lighttpd web server, SQLite database, rescue tools, IRC client, SSH client and server powered by Dropbear, X window system, JWM (Joe's Window Manager), gFTP, Geany IDE, Mozilla Firefox, AlsaPlayer, GParted, a sound file editor and more. The SliTaz ISO image fits on a less than 30 MB media and takes just 80 MB of hard disk space.

13. RancherOS (104)
RancherOS is a tiny Linux distribution that runs the entire operating system as Docker containers. This includes system services, such as udev and rsyslog. RancherOS includes only the bare minimum amount of software needed to run Docker. This keeps the binary download of RancherOS very small. Everything else can be pulled in dynamically through Docker.

14. Raspbian (130)
Raspbian is a free operating system based on Debian GNU/Linux and optimised for the Raspberry Pi hardware (the armhf processor architecture). Raspbian comes with over 35,000 packages, or pre-compiled software bundled in a nice format for easy installation on a Raspberry Pi. The initial build was completed in June of 2012, but the distribution continues to be active developed with an emphasis on improving the stability and performance of as many Debian packages as possible. Although Debian produces a distribution for the arm architecture, it is compatible only with versions later than the one used on the Raspberry Pi (ARMv7-A CPUs and higher vs the Raspberry Pi's ARMv6 CPU).

15. OpenELEC (134)
OpenELEC is a Linux-based embedded operating system built specifically to run Kodi, the open source entertainment media hub. The idea behind OpenELEC is to allow people to use their Home Theatre PC (HTPC) like any other device one might have attached to a TV, like a DVD player or Sky box. Instead of having to manage a full operating system, configure it and install the packages required to turn it into a hybrid media center, OpenELEC is designed to be simple to install, manage and use, making it more like running a set-top box than a full-blown computer.

16. OSMC (137)
OSMC (formerly Raspbmc) is a Debian-based minimal Linux distribution that brings the Kodi media centre software to a Raspberry Pi, Apple TV and Vero devices. This device has an excellent form factor and enough power to handle media playback, making it an ideal component in a low-cost HTPC (Home Theatre Personal Computer) setup, yet delivering the same Kodi experience that can be enjoyed on much more costly platforms.

17. Void (138)
Void is an independently-developed, general-purpose operating system based on the monolithic Linux kernel. It features a hybrid binary/source package management system which allows users to quickly install, update and remove software, or to build software directly from sources with the help of the XBPS source packages collection. Other features of the distribution include support for Raspberry Pi single-board computers (both armv6 and armv7), rolling-release development model with daily updates, integration of OpenBSD's LibreSSL software, and native init system called "runit".

18. Devuan GNU+Linux (146)
Devuan GNU+Linux is a Linux distribution forked from Debian in 2015. The project's primary goal is to provide a variant of Debian without the complexities and dependencies of systemd, an init system and services manager originally developed by Red Hat and later adopted by most other Linux distributions. Devuan's initial beta release was made available in April 2016, together with an upgrade path from Debian 7.0 "Wheezy" and a possibility to switch to Devuan from Debian 8.0 "Jessie". The distribution adopted Xfce as its default desktop.

19. NetBSD (151)
NetBSD is a free, secure, and highly portable UNIX-like Open Source operating system available for many platforms, from 64-bit AlphaServers and desktop systems to handheld and embedded devices. Its clean design and advanced features make it excellent in both production and research environments, and it is user-supported with complete source. Many applications are easily available through The NetBSD Packages Collection.

20. OpenMediaVault (156)
OpenMediaVault is a Network-Attached Storage (NAS) solution based on Debian GNU/Linux. It contains services like SSH, (S)FTP, SMB/CIFS, DAAP media server, rsync, BitTorrent and many more. Thanks to a modular design it can be enhanced via plugins. OpenMediaVault is primarily designed to be used in home environments or small home offices, but is not limited to those scenarios. It is a simple and easy-to-use out-of-the-box solution that will allow everyone to install and administrate a Network-Attached Storage without deeper knowledge.

21. Lakka (169)
Lakka is a lightweight Linux distribution that transforms a small computer into a full blown game console. The distribution is based on OpenELEC and runs the RetroArch console emulator. Lakka is capable of running on a variety of hardware, including personal computers, Raspberry Pi boards and WeTek Play devices.

22. NAS4Free (171)
NAS4Free is an embedded open-source NAS (Network-Attached Storage) distribution based on FreeBSD. NAS4Free supports sharing across multiple operating systems, including Windows, Apple and UNIX-like systems. NAS4Free is easy to set up in most home and enterprise environments and will allow to manage and share large amounts of data easily across a network. NAS4Free also incorporates many different streaming features for sharing multimedia with other devices on the network. NAS4Free includes ZFS v28 (RAIDZ, RAIDZ2 and RAIDZ3) Software RAID (0,1,5), Disk Encryption, S.M.A.R.T / Email Reports, and it supports the following protocols: CIFS (samba), FTP, NFS, TFTP, AFP, RSYNC, Unison, iSCSI (initiator and target), HAST, CARP, Bridge, UPnP, and BitTorrent. All are highly configurable by using a web interface.

23. CRUX (177)
CRUX is a lightweight, Linux distribution for computers running on 64-bit x86 and ARM processors. The distribution is targeted at experienced Linux users. The primary focus of this distribution is "keep it simple", which is reflected in a simple tar.gz-based package system, BSD-style initscripts, and a relatively small collection of trimmed packages. The secondary focus is utilization of new Linux features and recent tools and libraries.

24. RISC OS Open (223)
RISC OS is a computer operating system originally designed by Acorn Computers Ltd in Cambridge, England in 1987. RISC OS was specifically designed to run on the ARM chipset, which Acorn had designed concurrently for use in its new line of Archimedes personal computers. It takes its name from the RISC (reduced instruction set computing) architecture supported. Fast, compact and efficient, RISC OS is developed and tested by a loyal community of developers and users. RISC OS is not a version of Linux, nor is it in any way related to Windows, and it has a number of unique features and aspects to its design.

25. Plop Linux (234)
Plop Linux is a small distribution that can boot from CD, DVD, USB flash drive (UFD), USB hard disk or from network with PXE. It is designed to rescue data from a damaged system, backup and restore operating systems, automate tasks and more.

26. Volumio (268)
Volumio (formerly RaspyFi) is a Debian-based distribution originally made for the Raspberry Pi single-board computer, but later expanded to other embedded devices, including CuBox, BeagleBone Black and UDOO. It aims to fully integrate Music Player Daemon, an open-source music player server, into the current Debian releases and to optimise it for Audiophile-quality music playback. Volumio also makes it simple to play music library directly from a USB storage device or from any network-attached storage and it also enables users to listen to web-based radio stations from Spotify, Last.fm and SoundCloud.