Unix is not open source, it is proprietary. Linux is the
open-source version of Unix.
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Open Source Geospatial Foundation's motto is 'Your Open Source
Compass'.
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"Open-source" means that the source code of a program is
available, and may be modified legally. Open-source programs often
tend to be free of charge as well, but that's not what
"open-source" means.
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solaris is open source
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Open source software is software that allows the source code to
be used. Oftentimes, they are free to use. Open source software is
copyrighted.