FreeSBIE: The FreeBSD System run able from cdrom.
LiveCD project sponsored by the main Italian FreeBSD User Group, supports an FreeBSD operating system that is able to load directly from a bootable CD, without any install process or hard disk usage.
PicoBSD
FreeBSD.org Development project, which allows secure dialup access, small diskless router on one standard 1.44MB floppy, runs on minimum 386SX CPU with 8MB RAM, needs no hard disk. Description, documents, downloads.
Quantix Project
The Quantix project is a FreeBSD-derivative intended to provide a simple yet elegant FreeBSD system to every desktop.