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- Android
- Firefox OS
- Linux

Android is an operating system based on the Linux kernel, and designed primarily for touchscreen mobile devices such as smartphones and tablet computers. Initially developed by Android, Inc., which Google backed financially and later bought in 2005, Android was unveiled in 2007 along with the founding of the Open Handset Alliance: a consortium of hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. The first publicly available smartphone running Android, the HTC Dream, was released on October 22, 2008.

Firefox OS (project name: Boot to Gecko, also known as B2G) is a Linux-based open-source operating system for smartphones and tablet computers and is set to be used on smart TVs. It is being developed by Mozilla, the non-profit organization best known for the Firefox web browser. Firefox OS is designed to provide a "complete" community-based alternative system for mobile devices, using open standards and approaches such as HTML5 applications, JavaScript, a robust privilege model, open web APIs to communicate directly with cellphone hardware, and application marketplace. As such, it competes with proprietary systems such as Apple's iOS, Google's Chrome OS and Microsoft's Windows Phone, as well as other open source systems such as Android, Jolla's Sailfish OS and Ubuntu Touch.

Linux is a Unix-like and POSIX-compliant computer operating system assembled under the model of free and open source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on 5 October 1991 by Linus Torvalds.

Linux was originally developed as a free operating system for Intel x86-based personal computers. It has since been ported to more computer hardware platforms than any other operating system. It is a leading operating system on servers and other big iron systems such as mainframe computers and supercomputers: as of June 2013, more than 95% of the world's 500 fastest supercomputers run some variant of Linux, including all the 44 fastest. Linux also runs on embedded systems (devices where the operating system is typically built into the firmware and highly tailored to the system) such as mobile phones, tablet computers, network routers, building automation controls, televisions and video game consoles; the Android system in wide use on mobile devices is built on the Linux kernel.

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### Linux

Linux is a Unix-like and POSIX-compliant computer operating system assembled under the model of free and open source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on 5 October 1991 by Linus Torvalds.

Linux was originally developed as a free operating system for Intel x86-based personal computers. It has since been ported to more computer hardware platforms than any other operating system. It is a leading operating system on servers and other big iron systems such as mainframe computers and supercomputers: as of June 2013, more than 95% of the world's 500 fastest supercomputers run some variant of Linux, including all the 44 fastest. Linux also runs on embedded systems (devices where the operating system is typically built into the firmware and highly tailored to the system) such as mobile phones, tablet computers, network routers, building automation controls, televisions and video game consoles; the Android system in wide use on mobile devices is built on the Linux kernel.

### Firefox OS

Firefox OS (project name: Boot to Gecko, also known as B2G) is a Linux-based open-source operating system for smartphones and tablet computers and is set to be used on smart TVs. It is being developed by Mozilla, the non-profit organization best known for the Firefox web browser. Firefox OS is designed to provide a "complete" community-based alternative system for mobile devices, using open standards and approaches such as HTML5 applications, JavaScript, a robust privilege model, open web APIs to communicate directly with cellphone hardware, and application marketplace. As such, it competes with proprietary systems such as Apple's iOS, Google's Chrome OS and Microsoft's Windows Phone, as well as other open source systems such as Android, Jolla's Sailfish OS and Ubuntu Touch.

### Android

Android is an operating system based on the Linux kernel, and designed primarily for touchscreen mobile devices such as smartphones and tablet computers. Initially developed by Android, Inc., which Google backed financially and later bought in 2005, Android was unveiled in 2007 along with the founding of the Open Handset Alliance: a consortium of hardware, software, and telecommunication companies devoted to advancing open standards for mobile devices. The first publicly available smartphone running Android, the HTC Dream, was released on October 22, 2008.

### webOS

webOS also known as LG webOS and Open webOS, is a Linux-based operating system for smart TVs, and formerly a mobile operating system. Initially developed by Palm, which was acquired by Hewlett-Packard, the operating system was later sold to LG Electronics. Through all iterations of the operating system (Palm, HP and now LG) the official name has been consistently stylized as webOS (lowercase 'w'). Palm launched WebOS in January 2009, then called Palm WebOS. Various versions of WebOS have been featured on several devices, including Pre, Pixi, and Veer phones and the HP TouchPad tablet. The latest version, 3.0.5, was released on January 12, 2012. After abandoning the TouchPad and the proposed sale of the HP Personal Systems Group, HP made the platform open source, and it became Open WebOS. Code specific to the existing devices was released as WebOS Community Edition (CE), with support for the existing HP hardware. Open WebOS includes open source libraries designed to target a wider range of hardware.

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