BackTrack : An Innovative Penetration Testing live Linux distribution
This excellent bootable live-CD Linux distribution comes from the merger of Whax and Auditor. It boasts a huge variety of Security and Forensics tools and provides a rich development environment. User modularity is emphasized so the distribution can be easily customized by the user to include personal scripts, additional tools, customized kernels, etc.
Bastille : Security hardening script for Linux, Mac OS X, and HP-UX The Bastille Hardening program “locks down” an operating system, proactively configuring the system