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Operating Systems - sites beginning with: O

This category lists operating systems (OSs) based on open source code. Open Source computer programs are those that include source code, and/or for which the source code is freely available, or made available without a fee or limited permissions.

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The OpenBSD project
OpenBSD.org produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system.
http://www.openbsd.org/

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