SerenityOS/serenity

SerenityOS is a complete, self-hosted desktop operating system built from the kernel up. It features a monolithic kernel architecture that manages system services, hardware drivers, and networking within a single address space. The system provides a full computing environment, including a proprietary windowing system and a suite of native desktop applications, all while maintaining a POSIX-compliant interface for standard system programming.

The project is distinguished by its integrated development workflow, which relies on a cross-compilation build pipeline to generate system images from host machines. Developers iterate on low-level changes within a virtualization-based environment that simulates physical hardware, allowing for isolated testing and debugging of the kernel and user-space components.

To support a broader software ecosystem, the system includes an integrated porting layer that adapts and compiles third-party open source applications to run natively. This infrastructure maps external dependencies to local libraries, enabling the execution of standard software within the custom environment. The build process is managed through a collection of scripts that orchestrate the compilation of the entire operating system and its associated software ports.