TrueBSD is a LiveDVD operating system based on FreeBSD with many useful applications. All open programs will keep working even when you eject LiveDVD (using command cdcontrol eject) in order to get some data from your own CDs. Just don’t forget to insert the LiveDVD again before starting any other programs.
TrueBSD is distributed under BSD license, but some of the included software can be covered by some other license.
At this moment, the most recent version is TrueBSD 2.0-RC2, based on FreeBSD 7.1-PRERELEASE.