Penguin
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BerkeleySoftwareDistribution, or perhaps BusinessSystemsDevelopments.

Has a few Free distributions:

  • FreeBSD FreeBSD.org
    FreeBSD is an advanced operating system for Intel ia32 compatible, DEC Alpha, and PC-98 architectures. It is derived from BSD UNIX, the version of UNIX developed at the University of California, Berkeley.
  • NetBSD
    NetBSD is a free, secure, and highly portable UNIX-like operating system available for many platforms, from 64-bit AlphaServers? and desktop systems to handheld and embedded devices.
  • OpenBSD
    The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography.

and a few others:

  • BSDi|?

etc...

Yet Another Three Letter Acronym