Free operating system supporting SMP "HelenOS"
Exactly the source code is BSD license. Supported CPUs are wide, 64bit also supported.
HelenOS project
http://www.helenos.eu/
SMP is symmetric multiprocessing.
Symmetric multiprocessing - Wikipedia
The downloads and screenshots are as follows.
Download
http://www.helenos.eu/?reason=download
Screenshots
http://www.helenos.eu/?reason=screenshots
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in Software, Posted by darkhorse_log