Closed Source

This category lists operating systems (OSs) based on closed source code. Some such OSs have open source variants (BeOS, DOS, Unix, VMS), or straddle these two licensing models (QNX).Closed Source computer programs, including OSs, are those that include no source code, and for which the source code is kept secret, or made available only for a fee, as in many realtime OSs.

Unix

Sub-Categories:

Corona Software AB - Software company located in Sweden, creator of popular VS SPACE system for Wang VS minicomputers.
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Commercial Operating Systems - Short, annotated, alphabetically sorted list and links, part of larger system.
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Commercial Operating System Comparison - International Data Corp. (IDC) white paper.
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