Tizen is an open source, standards-based software platform for multiple device categories, including smartphones, tablets, netbooks, in-vehicle infotainment devices, smart TVs, wearable and more. Tizen offers an innovative operating system, applications, and a user experience that consumers can take from device to device.

Tizen is an open source, standards-based software platform for multiple device categories, including smartphones, tablets, netbooks, in-vehicle infotainment devices, smart TVs, wearable  and more. Tizen offers an innovative operating system, applications, and a user experience that consumers can take from device to device.

Tizen - Operating System for Devices like Smartphones, Tablets

LineageOS is a free and open-source operating system for various devices, based on the Android mobile platform. LineageOS extends the functionality and lifespan of mobile devices from more than 20 different manufacturers. It is more personnel and secure.

LineageOS - A free and open-source operating system for various devices, based on the Android mobile platform

Android is a Linux-based operating system designed primarily for touchscreen mobile devices such as smartphones and tablet computers, developed by Google in conjunction with the Open Handset Alliance.

Android - Mobile OS from Google

Replicant is a fully free Android distribution running on several devices. Google decided to release Android SDK under an overall proprietary software license. Replicant comes for the rescue.

Replicant - Android Alternative

Ubuntu phone is a Ubuntu distribution which runs on mobile devices. With all-native core apps and no Java overhead, Ubuntu runs well on entry-level smartphones — yet it uses the same drivers as Android. So now it’s easy to bring a better experience to customers all over the world.

Ubuntu phone - Mobile Operating System from Ubuntu

Sailfish OS is a mobile operating system built on top of Mer project and Qt5. The UI is built with QML and QtQuick2 and Wayland. It is compatible with Android.
 
 The Sailfish OS architecture is primarily made up of three areas — the base kernel layer, the middleware layer and the app/UI layer: 
In the base layer, Sailfish OS uses a Linux kernel with hardware-specific additions. Hardware support is implemented by the Board Support Package (BSP) and Hardware Abstraction Layer (HAL) and is project-specific, and is typically kept private for commercial ports. 
In the middleware layer, Mer provides the core system components for building services above the hardware and kernel level. Android emulation is provided by libhybris, which bridges Linux libraries based on GNU C with those based on Bionic, such as Android. 
 The Qt C++ application development framework provides the primary development libraries. Aside from the main Qt modules, Sailfish OS uses add-on modules such as Qt Maps, Qt Sensors and Qt Contacts. Also, all Sailfish applications are written with QML, a Qt technology for easily building user interfaces into C++ applications.

Sailfish OS is a mobile operating system built on top of Mer project and Qt5. The UI is built with QML and QtQuick2 and Wayland. It is compatible with Android.

Sailfish OS - Mobile Operating System

CyanogenMod is an enhanced open source firmware distribution for smartphones and tablet computers based on the Android mobile operating system. It offers features and options not found in the official firmware distributed by vendors of these devices. CyanogenMod does not contain spyware or bloatware.
 Its features include Native theming support, FLAC audio codec support, A large Access Point Name list, An OpenVPN client, An enhanced reboot menu, support for Wi-Fi, Bluetooth, and USB tethering, CPU overclocking and other performance enhancements, Soft buttons and other "tablet tweaks", toggles in the notification pull-down (such as wi-fi, Bluetooth and GPS), App permissions management, as well as other interface enhancements. In many cases, CyanogenMod may increase performance and reliability compared with official firmware releases.

CyanogenMod is an enhanced open source firmware distribution for smartphones and tablet computers based on the Android mobile operating system. It offers features and options not found in the official firmware distributed by vendors of these devices. CyanogenMod does not contain spyware or bloatware.

Cyanogenmod - Alternative to Android

Firefox OS is a Linux kernel-based Operating System for smartphones and tablet computers and Smart TVs. 

Firefox OS - Operating System for Mobile, Tablet and Smart TV

Mer is an open, mobile-optimised, core distribution aimed at device manufacturers; powered by Qt/QML and HTML5 - openly developed, inclusive, and meritocratically governed.

MerProject - Operating System for Devices

CopperheadOS is a security and privacy focused mobile operating system compatible with Android apps. It provides Protection from zero-days, Hardened C standard library and compiler toolchain, Hardened kernel, Stronger sandboxing and isolation for apps & services, Firewall & network hardening and lot more.

CopperheadOS - A security and privacy focused mobile operating system compatible with Android apps 

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