Hello,
I made this list with all the interesting and extremely considerable distributions I'm able to find working on our raspberry pi. check out and enjoy.
The List :
OS General
Arch Linux armv6; OS, "older" Pi
http://archlinuxarm.org/platforms/armv6/raspberry-pi
Arch Linux armv7; OS, Pi 2
http://archlinuxarm.org/platforms/armv7/broadcom/raspberry-pi-2
DietPi; the minimal multi-talent
http://fuzon.co.uk/phpbb/viewtopic.php?f=8&t=6
Bhodi Linux; the Enlightened Linux Distribution
Homepage
Download
RedSleeve Linux; "special" Linux-port, OS
Homepage
Download
Minibian; minimal Raspbian
https://minibianpi.wordpress.com/
nOS; Ubuntu-based with KDE
http://nos.net.nz/
PiBang Linux; CrunchBang inspired, Raspbian-based
http://pibanglinux.com/index.html
Plan9; OS
Overview
Download
9front; Plan9-fork, cloud computing
Homepage
Download
pipaOS; compact Raspbian
http://pipaos.mitako.eu/
Gentoo Linux; source-based Linux distribution
https://www.gentoo.org/
AROS; Commodore Amiga OS based
Homepage
Download
Slackware ARM; OS
http://rpi.fatdog.eu/
slrpi; minimal Slackware
http://sourceforge.net/projects/slrpi/
FreeBSD; OS
https://wiki.freebsd.org/FreeBSD/arm/Raspberry%20Pi
openSUSE; OS
https://en.opensuse.org/HCL:Raspberry_Pi
Moebius; minimal Linux
http://moebiuslinux.sourceforge.net/
Hypriot; Pi armed with Docker
Homepage
Download
Void Linux; independent distribution, OS
http://www.voidlinux.eu/
Tiny Core Linux; the smallest one (~12 mb), OS
http://www.tinycorelinux.net/ports.html
OpenMandriva Lx; OS, kde4
Homepage
Download
Ubuntu 14.04 LTS; OS
https://wiki.ubuntu.com/ARM/RaspberryPi
RaspEX; based on Debian 8, Ubuntu 15.04 and Linaro, uses LXDE
http://raspex.exton.se/?p=79
NixOS Linux; OS
Homepage
Download
Tizen OS; open and flexible operating system
Homepage
Download
Xubuntu 14.04 LTS; OS
http://stefanius.de/xubuntu-14-04-lts-sd-card-image-fuer-raspberry-pi-2-veroeffentlicht
PiLFS; Linux From Scratch
http://www.intestinate.com/pilfs/
AEROS; hybrid distribution of AROS and Linux ( commercial ! )
http://www.aeros-os.org/
"OS", for special purposes, tools
Kano OS; learn linux basics or programming skills the lovely way, for "kids"
http://www.kano.me
SliTaz; secure and high performance OS
http://www.slitaz.org/en/
Kali Linux; penetration testing, security, tools
http://docs.kali.org/kali-on-arm/install-kali-linux-arm-raspberry-pi
BlackArch Linux; penetration testing, security, tools
http://blackarch.org/downloads.html#blackarch-arm
Archphile; modified ArchLinux, support for USB and I2S Dacs
http://archphile.org/introduction
PwnPi; pen test drop box distro
http://pwnpi.sourceforge.net/
QtonPi; Qt5 programming
http://wiki.qt.io/QtonPi
PiBox; lightweight GNU/Linux development platform
http://www.graphics-muse.org/wiki/pmwiki.php/RaspberryPi/RaspberryPi
Raspberry WebKiosk; web kiosks and multi-user web workstations
http://www.binaryemotions.com/web-kiosks/raspberry-webkiosk/
ThinBox; Windows-based server connection
http://jontylovell.net/index.php?page=30
OpenWrt; wireless routing
http://wiki.openwrt.org/toh/raspberry_pi
VPNbian; OpenVPN Gateway
http://techfunbln.blogspot.de/2013/09/raspberry-pi-as-openvpn-gateway-with-or.html
NetBSD; networking
http://wiki.netbsd.org/ports/evbarm/raspberry_pi/
PiPoint; wireless access point
http://www.pi-point.co.uk/
Angstrom; tiny server distribution
Homepage
Download
Mini vMac; early-macintosh emulator
Homepage
Download
FINNIX; system administrations
http://www.finnix.org/
Raspberry Digital Signage; OS designed for digital signage
http://www.binaryemotions.com/digital-signage/raspberry-digital-signage/
IPfire; Router, Firewall solution
Homepage (german homepage)
Download
arkOS; self-hosting, cloud solution
https://arkos.io/what-is-arkos/
NARD SDK; software development kit
http://www.arbetsmyra.dyndns.org/nard/
SailPi; Sailfish OS in Pi
https://sailpi.wordpress.com/
OpenMediaVault; NAS solution
http://www.openmediavault.org/
RACHEL-Pi; "offline" education server solution
http://pi.worldpossible.org/index.html
KA-Pi; Khan Academy on a Pi
http://pi.mujica.org/index.html
Mediacenter, gaming and others
Xbian; Mediacenter
Homepage
Download latest
OSMC; Mediacenter
https://osmc.tv/
SlaXBMC; Mediacenter
http://slaxbmc.blogspot.co.uk/
PiPlay; formerly PiMAME, gaming and emulation
http://piplay.org/
Volumio; audiophile music player
https://volumio.org/project/
RetroPie; multi gaming and emulation
Homepage
Download
GeeXBoX; Mediacenter
http://www.geexbox.org/
Raspicade; Moebius-based arcade distribution
http://sourceforge.net/projects/raspicade/
recalbox; multi emulation platform
http://www.recalbox.com/diyrecalbox
Pi MusicBox; A Spotify, SoundCloud, Google Music player ...
http://www.woutervanwijk.nl/pimusicbox/
DarkELEC; Mediacenter
http://darkimmortal.com/category/raspberry-pi/
runeaudio
http://www.runeaudio.com/about/
recommendations and suggestions are welcome.
this list is partly based on this one (you can find several more detailed descriptions there) but most time I need to search the web for hours while I'm trying to get the most complete list for us . This is the largest list out there !!
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