SerenityOS

SerenityOS is a free and open source desktop operating system that has been in continuous development since 2018. Initially the one-man project of Swedish programmer Andreas Kling, SerenityOS is now developed by a community of hobbyists. The system supports the x86-64 instruction set (though work is currently at the early stages to support aarch64 and RISCV), features a preemptive kernel, and hosts multiple complex applications including its own web browser, Ladybird, and integrated development environment (IDE). Provided by Wikipedia