postmarketOS (pmOS) is a free, open-source Linux-based operating system designed for mobile devices like smartphones and tablets.
Motorola's OS history mirrors the entire mobile industry's evolution, from simple proprietary software to the modern smartphone era
Maemo was a pioneering, Linux-based open-source operating system developed by Nokia in the mid-2000s for its "Internet Tablets" and smartphones.
Beautiful Aqua GUI with advanced graphics (Quartz, Metal)
ReactOS
nduinOS is a cloud-native, container-based operating system designed from the ground up for a connected world. Its history is a story of a bold vision finding a practical home.
List of Operating Systems
Redox OS is an ongoing, ambitious project that serves as a proof-of-concept for building a modern, memory-safe operating system from the ground up
BOSS OS is either the Indian Linux distribution promoting digital independence, or a conceptual term for a core managing system, most famously realized in early web-based desktop environments
TempleOS Entire OS is a single developer’s creation, including kernel, compiler, editor, and even the shell
Originally Acorn Computers, now maintained by RISC OS Open Ltd
Advanced user account controls, file permissions, job accounting.