polyBSD is a "multi"-purpose (hence "poly")
framework for building embedded systems based on
NetBSD. Essentially, it is a minimal installation
of NetBSD 3.0.1 designed to run from a 256MB flash
card or USB memory stick. Once the image is
written to the target media, a user can simply
boot from it and build their own system by using
NetBSD's extensive "pkgsrc" collection. The user
is only limited by the free space left on the
256MB memory card/stick.