Android is described as 'Open-source mobile operating system, seamlessly integrating with Google services, enabling extensive app support and hardware compatibility across brands' and is a leading Mobile OS in the os & utilities category. There are more than 25 alternatives to Android for a variety of platforms, including Android, Linux, Linux Mobile, Android Tablet and Self-Hosted apps. The best Android alternative is LineageOS, which is both free and Open Source. Other great apps like Android are Ubuntu Touch, GrapheneOS, /e/ and postmarketOS.
Astian OS is an operating system that is based on the discontinued Firefox OS, development by Astian Foundation, thus allowing support for mobile devices, TV's, and other devices. Astian OS is completely free and open.
KaiOS brings smartphone-like functionalities to affordable phones: the KaiStore for apps. Video calls over 4G. Mobile payments through NFC. Even dual-SIM support.
B2G is a community maintained open source operating system for smartphones, tablets, smart TVs and other connected devices. The project was started in 2011 and is based on the Linux kernel and Gecko rendering engine.
QtMoko is debian distribution for Linux based SmartPhones, like Openmoko Freerunner and Goldelico's GTA04 phone. Phone and user interface is based on QT Extendeded formerly known as Qtopia..
Oniro is an Eclipse Foundation project focused on the development of a distributed open source operating system for consumer devices, regardless of the brand, model, make.
Qt6/QML Wayland compositor on PostmarketOS. Runs on any device with mainline Linux support or Libhybris. Core features work at 60 FPS on OnePlus 6. Performance target: fluid on decade-old chipsets, exceptional on newer hardware.
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