MINIX 3 is a new UNIX clone that is flexible, secure, and self-healing leading to high reliability, even in the presence of software faults.
https://www.minix3.org
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The FreeBSD Project. FreeBSD® is an advanced operating system for x86 compatible (including Pentium® and Athlon™)
https://www.freebsd.org
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The openSUSE project is a worldwide community program sponsored by Novell that promotes the use of Linux everywhere.
https://www.opensuse.org
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Red Hat Linux was a popular Linux distribution, until 2003 when it was discontinued. It has been replaced by Fedora Core
https://www.redhat.com
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EnGarde Secure Linux is an open source server environment designed to be secure by default and easy to administer.
https://www.engardelinux.org
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Debian GNU/Linux is maintained and updated through the work of many users who volunteer their time and effort.
https://www.us.debian.org
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Red Flag Linux (?? Linux) is a Linux distribution for the constantly growing base of Chinese technologies
https://www.redflag-linux.com
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true microkernel OS. Under QNX Neutrino, every file system runs outside the kernel, in the safety of memory-protected user space.
https://www.qnx.com
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