In the Beginning was the Command Line - A history of operating systems, by Neal Stephenson.
History of the AmigaOS GUI - Dedicated to the preservation and restoration of the Amiga Workbench's history.
Operating Systems History - A Brief History of Computer Operating Systems from the mid 1950s on.
OldOs.org - Resource for utilities, history, and much needed to get many old computers up and running, physically or in emulation.
Easysoft - Operating systems are defined here. All type of operating systems like windows,unix,linux,debian are defined here.open bsd as well as bsd is described here
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