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en.wikipedia.org/wiki/List_of_operating_systems

List of operating systems

en.wikipedia.org/wiki/List_of_operating_systems
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freebyte.com
Free Operating systems
Operating Systems, freeware and non-free, such as Linux, FreeBSD, BeOS, Zeta, Unix, RiscOS, Amiga, DOS-clones, Windows-emulators, etc.
en.wikipedia.org/wiki/Operating_system
Operating system
Operating system...
computerhope.com
Computer Operating Systems
5-11-2007 · Helping you with questions you may have about computer operating systems as well as linking you to all the major computer operating systems.