NetBSD is one of several Unix-like operating systems stemming from the BSD4.4-lite release of the Berkeley Software Distributions.
Originally derived from 386BSD, on April 3rd, 1993, NetBSD (along with FreeBSD) later had to reimport their developments in March of 1994 to the BSD4.4-lite base after the settlement of a lawsuit between AT&T's USL and the University of Columbia/BSDi.
NetBSD has since moved to become one the most highly ported operating system in the world, running on more than 50 platforms.
Currently working towards the 2.0 release, tentitavely set for this spring, NetBSD is at 1.6.2 for it's stable release.
NetBSD was used for the base for the development of OpenBSD, a security focused BSD that runs on 11 platforms, when co-founder of the NetBSD Project Theo de Raadt was forced out of the core development team for personality and opinion differences.
noun - primary two
The NetBSD Project, the organisation that manages the development of the NetBSD operating system. The group that was responsible for registering NetBSD as a trademark and is charged with defending it.
... that's because it's so boring noone's bothering to look closely enough to try and hack it