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Obsolete OSes that have been open-sourced?

 
Daniel Levine
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I'm looking around for obsolete, formerly-proprietary, now-open-source operating systems. Preferably UNIX, preferably self-hosting; but anything will do if it can run under QEMU and has a GUI..

What options are there? So far I've only found
- RISC OS (old version is sorta kinda open source)
- MS-DOS 1.0 (no thank you)\

Are there any others out there?
 
Ulf Dittmer
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Not sure about the QEMU thing, but Plan 9 and Oberon come to mind.
 
Daniel Levine
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Thank you, I somehow wasn't aware that Plan9 was open source!

Edit: there is also FreeVMS, a VMS clone for x86-64:

http://www.freevms.net/

Not UNIX, and probably a clean-room implementation, but looks interesting.
 
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