Debian GNU/Linux is one of the most popular and influential Linux distributions around. It's known for strict adherence to the Unix and free software philosophies, the abundance of options it provides the user, and for being the base of many other distributions, like Ubuntu, MEPIS, DSL, Knoppix, etc. A classic among classics.
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More information: http://www.debian.org/
Debian stuff available right now:
Debian Charcoal t-shirt
Debian Woman t-shirt