External documentation

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List of generic documentation elsewhere on the web.
This does not include documentation for specific software: a link to them should be placed on the wiki page for that software.

Howtos and linux generic documentation

The Linux Documentation Project:
http://www.tldp.org/

HowtoForge provides user-friendly Linux tutorials about almost every topic:
http://www.howtoforge.com/

Distro-specific documentation

Please add the documentation for your favourite distros here.

Debian

Debian official documentation:
http://www.debian.org/doc/

Debian Documentation Project:
http://ddp.alioth.debian.org/

Ubuntu

Ubuntu official documentation:
https://help.ubuntu.com/

See also

30 Best Sources For Linux / *BSD / Unix Documentation On the Web
http://www.cyberciti.biz/tips/linux-unix-bsd-documentations.html