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Banana is an operating system (OS) for x86 and x86-64 computers. Comes with a GUI, including solitaire, minesweeper and a photo viewer!
ATOS is an operating system inspired by OS/161. It is designed to be lightweight and easy to understand. Currently implemented for x86, but should be easy to port to other platforms.
Merlon is an portable operating system (OS), currently implemented for x86. It is designed to be a lightweight operating system, and written is from scratch as much as possible, with easy to read code.