- Temple OS. Very simple OS but has interesting innovations. http://www.codersnotes.com/notes/a-constructive-look-at-templeos/ http://www.codersnotes.com/notes/

- Temple OS. Very simple OS but has interesting innovations. http://www.codersnotes.com/notes/a-constructive-look-at-templeos/ http://www.codersnotes.com/notes/a-constructive-look-at-temp... - Amiga OS / Morph OS - Menuet OS / Kolibri OS. minimalistic and 100% written in Assembly.