Bitrig is a free, fast, and secure Unix-like Open Source operating system. It is available on current hardware platforms. The source code is freely available under a permissive license.

Manux is a free (libre) Linux-compatible operating system designed to withstand zero-day attacks in userspace.

Ready. Set. Game. Simple and elegant operating system

Menuet est un OS graphique écrit et autocompilé en assembleur 32 bits.
Il est distribué sous la General Public License.