Arudius is a live CD Linux distribution based on Slackware (Minislack/Zenwalk) and Linux Live scripts. It contains an extensive set of software tools used by information security professionals for information assurance and vulnerability analysis. Its goal is to include the most complete set of useful security tools and still maintain a small footprint so it can fit on a 210MB mini-CD.
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.
OAMP stands for (O)penBSD + (A)pache + (M)ySQL + (P)ostgreSQL + PHP. It is the OpenBSD cousin of LAMP, except that it also provides the SQlite database engine, Perl, Ruby, and Python. In addition, OAMP provides phpMyAdmin and phpPgAdmin for easy administration of MySQL and PostgreSQL over the Web.