Kling began writing SerenityOS in mid-2018, and recorded most of the development sessions using screen capture software. He would later start posting these sessions to YouTube. By mid-2019, a GitHub repository was created to facilitate community development of the project. Many people from around the world have joined to contribute to the project. It currently receives major additions from the open source development community every week. Kling has stated that he is surprised by all the development contributions and is constantly reviewing and publishing the work from other contributors.
SerenityOS is designed to be a simple Unix-like operating system inspired by the user interfaces common among desktop computers in the 1990s. Although it is currently being designed as a virtual machine image, it has features such as a 32-bit kernel with preemptive multitasking, an IPv4 networking stack, ext2 file system, a graphical toolkit, and a compositing window manager. Many new features are being added rapidly and Kling has the goal of eventually making SerenityOS run outside of a virtual machine environment.
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