- Nuovi (non Linux based):

ATEOS: http://atheos.syllable-norden.info/
Syllable: http://web.syllable.org/pages/index.html
Visopsys: http://visopsys.org/
Aros: http://aros.sourceforge.net/ (AmigaOS 3.1 compatibile)

FreeBSD: http://www.freebsd.org/
ReactOS: http://reactos.com (Windows XP/NT compatibile)

- Vecchi (non Linux based):

Beos: http://www.bebits.com/app/2680
Minix: http://www.minix3.org/

- Closed Source (non Linux based):

SkyOS: http://www.skyos.org/

Se ne conoscete altri (non linux) aggiungeteli a questa lista