Other Operating Systems - BSD-style Licensed
- FreeBSD (Network services and source focussed OS) (cvs) (ml) (TrustedBSD Set of "Common Criteria" security extensions to FreeBSD) (PicoBSD single floppy FreeBSD version) (ClosedBSD FreeBSD based single floppy firewall OS with a ncurses based administration interface)
- OpenBSD (Security and source focussed OS) (cvs) (ml) (EmBSD Stripped down version of OpenBSD aimed at usage with compact flash cards)
- NetBSD (Portability and source focussed OS) (cvs) (ml)
- DragonFly BSD (Experimentation and re-design focussed OS. DragonFly is a code-fork of FreeBSD.) (cvs) (ml)
- Xmach (BSD based OS based on the Mach microkernel) (cvs)
- TinyOS (Small operating system for wireless data-gathering computers) (cvs) (ml)
- Unununium (Experimental realtime OS in which any component can be reloaded or replaced at any time) (cvs) (ml)
- NewOS (Experimental OS, with an emphasis on design flexibility and portability) (ml)
- Minix (Educational, un*x inspired, micro kernel project)
- RadiOS (Micro kernel based OS written entirely in x86 NASM assembly language) (ml)