RISC OS
RISC OS is an operating system originally developed by Acorn Computers in the 1980s for their ARM-based computers. It is known for its efficient performance and user-friendly graphical interface, making it popular in educational settings and among hobbyists. RISC OS supports multitasking and features a unique desktop environment that allows users to manage files and applications easily.
The system is designed to run on ARM architecture, which is widely used in mobile devices and embedded systems today. RISC OS has a dedicated community that continues to develop and maintain the software, ensuring compatibility with modern hardware and providing updates for users.