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NetBSD is a free, secure, and highly portable Unix-like Open Source
operating system available for many platforms, from 64-bit Opteron machines
and desktop systems to handheld and embedded devices. Its clean design and
advanced features make it excellent in both production and research
environments, and it is user-supported with complete source. Many
applications are easily available through pkgsrc, the NetBSD Packages
Collection.

More information: www.NetBSD.org