DragonFly BSD:

DragonFly is an operating system and environment designed to be the logical continuation of the FreeBSD-4.x OS series. These operating systems belong in the same class as Linux in that they are based on UNIX ideals and APIs. DragonFly is a fork in the path, so to speak, giving the BSD base an opportunity to grow in an entirely new direction from the one taken in the FreeBSD-5 series.

FreeBSD:

FreeBSD is an advanced operating system for x86 compatible, AMD64, Alpha, IA-64, PC-98 and UltraSPARC® architectures. It is derived from BSD, the version of UNIX® developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.

FreeSBIE:

FreeSBIE is a LiveCD based on the FreeBSD Operating system, or even easier, a FreeBSD-based operating system that works directly from a CD, without touching your hard drive.

NetBSD:

NetBSD is a free, secure, and highly portable UNIX-like Open Source operating system available for many platforms, from 64-bit AlphaServers and desktop systems to handheld and embedded devices. Its clean design and advanced features make it excellent in both production and research environments, and it is user-supported with complete source. Many applications are easily available through The NetBSD Packages Collection.

OpenBSD:

The OpenBSD project produces a FREE, multi-platform 4.4BSD-based UNIX-like operating system. Our efforts emphasize portability, standardization, correctness, proactive security and integrated cryptography. OpenBSD supports binary emulation of most programs from SVR4 (Solaris), FreeBSD, Linux, BSD/OS, SunOS and HP-UX. OpenBSD is freely available from our FTP sites, and also available in an inexpensive 3-CD set.

OpenBSD CD Bootable Firewall System:

This project allows you to set up a full featured OpenBSD firewall without the use of a hard disk. The system boots from a CDROM and stores configuration information on either a floppy, or a USB mass storage device, such as a "pen drive" or a USB CompactFlash reader. The CD also contains a simple install script, to allow you populate a floppy or UMASS device with a basic firewall configuration. Simply boot the CD, select the media you wish to use, and answer some straightforward questions.

PC-BSD:

PC-BSD has as its goals to be an easy-to-install-and-use desktop operating system, based on FreeBSD. To accomplish this, it currently has a graphical installation, which will enable even UNIX novices to easily install and get it running. It will also come with KDE pre-built, so that the desktop can be used immediately. Currently in development is a graphical software installation program, which will make installing pre-built software as easy as other popular operating systems.