#18 Debian  

http://www.debian.org/

The universal operating system.

This distribution is the rock on which Ubuntu, Knoppix, DSL, and many other GNU/Linux distros are built; it is probably the most flexible distribution out there, and runs on more architectures than any other distro out there, even on HURD and BSD kernels. Debian features a social contract that guarantees it's dedication to FOSS ideals.

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