Ubuntu is a fork of Debian. Its main goal is to make easy to use Linux desktop. It provides stylish and intuitive user interface called Unity. All of the editions of Ubuntu share common infrastructure and software, making Ubuntu a unique platform that scales from consumer electronics to the desktop, and into the cloud for enterprise computing. It comes installed with a wide range of software. It supports 32 bit and 64 bit architecture.

Ubuntu - Operating System

The openSUSE project creates one of the world's best Linux distributions, working together in an open, transparent and friendly manner as part of the worldwide Free and Open Source Software community. It is aimed towards users and developers working on the desktop or server. It is great for beginners, experienced users and ultra geeks alike, in short, it is perfect for everybody. It comes with more than 1,000 open source applications.

openSUSE - Linux for Open Minds

Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run.
Debian provides more than a pure OS: it comes with over 29000 packages, precompiled software bundled up in a nice format for easy installation on your machine.

Debian - The Universal Operating System

MINIX 3 is a free, open-source, operating system designed to be highly reliable, flexible, and secure. It is based on a tiny microkernel running in kernel mode with the rest of the operating system running as a collection of isolated, protected, processes in user mode.

Minix - Operating System by Andrew S. Tanenbaum

Peppermint is a Linux based Operating System that is Cloud / Web Application Centric, Sleek, User Friendly and Insanely Fast. Peppermint was designed for enhanced mobility, efficiency and ease of use. While other operating systems are taking 10 minutes to load, you are already connected, communicating and getting things done. And, unlike other operating systems, Peppermint is ready to use out of the box. Peppermint OS is under 512MB and easy to run as a Live CD or USB. Loads and Shuts down in Seconds. It was designed to be easy on your processor and system resources. The default Cloud Applications are simply included. The default desktop environment for Peppermint is LXDE (literally, “Lightweight X11 Desktop Environment”) which has shown itself time and again to be user friendly, easy on the eyes, and wicked fast.

Peppermint OS is a fork of Lubuntu. Peppermint is a Linux based Operating System that is Cloud / Web Application Centric, Sleek, User Friendly and Insanely Fast. Peppermint was designed for enhanced mobility, efficiency and ease of use. While other operating systems are taking 10 minutes to load, you are already connected, communicating and getting things done. And, unlike other operating systems, Peppermint is ready to use out of the box.

PeppermintOS - Linux based OS for Cloud

FreeRTOS is an open source, real-time operating system for microcontrollers that makes small, low-power edge devices easy to program, deploy, secure, connect, and manage. This includes securely connecting your small, low-power devices to AWS cloud services like AWS IoT Core or to more powerful edge devices running AWS IoT Greengrass. FreeRTOS is built with an emphasis on reliability and ease of use.
 
A microcontroller contains a simple, resource-constrained processor that can be found in many devices, including appliances, sensors, fitness trackers, industrial automation, and automobiles. Many of these small devices can benefit from connecting to the cloud or locally to other devices, but have limited compute power and memory capacity and typically perform simple, functional tasks. Microcontrollers frequently run operating systems that may not have built-in functionality to connect to local networks or the cloud, making IoT applications a challenge. FreeRTOS helps solve this problem by providing the kernel to run low-power devices as well as software libraries that make it easy to securely connect to the cloud or other edge devices, so you can collect data from them for IoT applications and take action.

FreeRTOS is an open source, real-time operating system for microcontrollers that makes small, low-power edge devices easy to program, deploy, secure, connect, and manage. This includes securely connecting your small, low-power devices to AWS cloud services like AWS IoT Core or to more powerful edge devices running AWS IoT Greengrass. FreeRTOS is built with an emphasis on reliability and ease of use.

Amazon FreeRTOS - Cloud-native IoT operating system for microcontrollers

ClearOS is a powerful network and gateway server designed for small organizations and distributed environments. The open source revolution in the software industry has made it possible to provide ClearOS at no cost. Among other features, antivirus, antispam, VPN and content filtering are built right into the software -- no need for expensive third party add-ons. With ClearOS, you can avoid costly vendor lock-in and proprietary formats; instead, you can embrace open standards and protocols. Its feature include:
 <UL>
	<LI>Integrated LDAP for User and Group Management</LI>
	<LI>User Security Certificate Manager</LI>
	<LI>Multi-WAN, VPN - PPTP, IPsec, OpenVPN, DMZ and 1-to-1 NAT, Firewall, Local DHCP and DNS Servers</LI>
	<LI>Bandwidth Management</LI>
	<LI>Intrusion Protection, Intrusion Prevention, Intrusion Detection</LI>
	<LI>Antimalware - Antivirus, Antiphishing, Antispyware, Antispam</LI>
	<LI>Protocol Filtering including Peer-to-Peer Detection</LI>
	<LI>Content Filter</LI>
	<LI>Web Proxy</LI>
	<LI>Access Control</LI>
	<LI>File and Print Services</LI>
	<LI>Mail Server - POP, IMAP, SMTP, Webmail, Retrieval, Archiving</LI>
	<LI>Database with MySQL</LI>
	<LI>Web Server with PHP Support</LI>
 </UL>

ClearOS is a powerful network and gateway server designed for small organizations and distributed environments. The open source revolution in the software industry has made it possible to provide ClearOS at no cost.  Among other features, antivirus, antispam, VPN and content filtering are built right into the software -- no need for expensive third party add-ons. With ClearOS, you can avoid costly vendor lock-in and proprietary formats; instead, you can embrace open standards and protocols.

ClearOS - Linux based Operating System

eyeOS is a disruptive desktop entirely usable from a web browser. eyeOS as a RIA (Rich Internet Application Framework). It has been completely developed with open technology and widely accepted standards such as PHP, MySQL, JavaScript, Qooxdoo, log4php, PHPUnit, OpenOffice and others, enabling the system to function on a common web server without any modifications, and using any standard browser without any additional plug-ins installed.
 <UL>
	<LI>Designed as a much more social desktop. The new version introduces new, easy and intuitive ways to share files, calendars and more between users and groups</LI>
	<LI>It has by default with applications to create and work with Office files</LI>
	<LI>It aims to be a great stable suite for comfortable online work, both individually and with other users simultaneously.</LI>
	<LI>Creating RIA (rich Internet applications) is easy and fast. eyeOS is a framework that combines JavaScript and PHP</LI>
	<LI>Access your documents from anywhere any device</LI>
	<LI>Control the access rights for each user</LI>
 </UL>

eyeOS is a disruptive desktop entirely usable from a web browser. eyeOS as a RIA (Rich Internet Application Framework). It has been completely developed with open technology and widely accepted standards such as PHP, MySQL, JavaScript, Qooxdoo, log4php, PHPUnit, OpenOffice and others, enabling the system to function on a common web server without any modifications, and using any standard browser without any additional plug-ins installed.

eyeOS - Cloud Computing Operating System

The original uClinux (you-see-linux) was a derivative of Linux 2.0 kernel intended for microcontrollers without Memory Management Units (MMUs). However, the Linux/Microcontroller Project has grown both in brand recognition and coverage of processor architectures. Today's uClinux as an operating system includes Linux kernel releases for 2.0 2.4 and 2.6 as well as a collection of user applications, libraries and tool chains. uClinux is mostly used in Embedded and Gaming device. uClinux is ported to Cisco routers, Motorola, Intel and many other devices and microcontrollers. 
 Sourceforge location: <A HREF="http://sourceforge.net/projects/uclinux/" target="_blank">http://sourceforge.net/projects/uclinux/</A>

The original uClinux (you-see-linux) was a derivative of Linux 2.0 kernel intended for microcontrollers without Memory Management Units (MMUs). However, the Linux/Microcontroller Project has grown both in brand recognition and coverage of processor architectures. Today's uClinux as an operating system includes Linux kernel releases for 2.0 2.4 and 2.6 as well as a collection of user applications, libraries and tool chains. uClinux is mostly used in Embedded and Gaming device.

uCLinux - Embedded Linux

Chromium OS is an open-source project that aims to build an operating system that provides a fast, simple, and more secure computing experience for people who spend most of their time on the web. 

Chromium OS - Google Chrome OS

ToaruOS is a completely-from-scratch hobby operating system: bootloader, kernel, drivers, C library, and userspace including a composited graphical UI, dynamic linker, syntax-highlighting text editor, network stack, etc. ToaruOS is intended as an educational resource, providing a representative microcosm of functionality found in major desktop operating systems.

ToaruOS - A hobby operating system built mostly from scratch

Chakra is a free, user-friendly and extremely powerful liveCD distribution based on the KDE Software Compilation. Chakra is by default a GTk free distribution specially made for run Qt based applications and frameworks at full performance. Its goal is to build an operating system that meets most requirements desktop users have today,

Chakra - Desktop OS

Vinux is a remastered version of the Ubuntu Linux Distribution optimised for visually impaired users. It provides a screen-reader, full-screen magnification and support for Braille displays out of the box! It can be run from a Live CD without making any changes to your hard drive. If you like it you can install it to a USB pendrive or to your hard drive either alongside Windows using the Virtual Version, or as a complete replacement for windows.

Vinux - Linux for Visually Impaired Users

Nachos is instructional software for teaching undergraduate, and potentially 
graduate, level operating systems courses. The assignments illustrate and explore all areas of modern operating systems, including threads and concurrency, multiprogramming, system calls, virtual memory, software-loaded TLB's, file systems, 
network protocols, remote procedure call, and distributed systems.

Nachos - Instructional Operating System

Sabily is a open source operating system designed by and for Muslims. It is based on the popular Ubuntu Linux distribution and has pre-installed packages for the Arabic language. With Sabily, Muslim users have “out of the box” Islamic software and tools like Islamic calendar, Quran viewer, Islamic prayer times application and lot more.

Sabily - Operating System for Muslims

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