Qubes is an open-source operating system designed to provide strong security for desktop computing. Qubes is based on Xen, the X Window System, and Linux, and can run most Linux applications and utilize most of the Linux drivers.
Debian is a Unix-like computer operating system and a Linux distribution that is composed entirely of free and open-source software, most of which is under the GNU General Public License, and packaged by a group of individuals known as the Debian project.
Trisquel is a Linux-based operating system derived from Ubuntu. The project aims for a fully free software system without proprietary software or firmware and uses Linux-libre, a version of the Linux kernel with the non-free code (binary blobs) removed.