Android - Android is an open source mobile operating system initially released by Google in 2008 and has since become of the most widely used operating systems on any platform.
PureOS - A user friendly, secure and freedom respecting OS for your daily usage
Symantec Endpoint Protection Mobile - Protect your business from malicious mobile attacks on modern operating systems such as Android and iOS.
CopperheadOS - Secure Android built for encrypted and secure phones by a privacy focused company. Available as security-centric and privacy focused Google-free Android for the latest devices. Fully integrated with the latest IDS and MDM enterprise technologies.
Mobian - Mobian, Debian for mobile devices
LineageOS - Operating system for smartphones and tablet computers, based on the Android