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A multi-platform BSD-based UNIX-like operating system. OpenBSD supports binary emulation of most binaries from SVR4 (Solaris), FreeBSD, Linux, BSDI, SunOS, and HPUX. OpenBSD is free and its copyright conditions allow for free redistribution for personal or commercial use. OpenBSD was founded in 1995 by Theo de Raadt and the initial release was made public in July 1996.

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