GNU/Linux

• Debian.org - Home of the Debian GNU/Linux operating system.
• FrozenTech's LiveCD List - A listing of LiveCD links with popularity voting.
• GNU.org: The GNU Project. Software can be free.
• LinuxQuestions.org - A good place to go with your questions about using GNU/Linux
• The Linux Documentation Project - GNU/Linux HOWTOs, FAQs, guides, etc.
• LinuxMafia.com virus rant: Rick rants about virus misconceptions regarding Linux.
• Parted Magic: A live-cd containing hard drive partitioning tools. Resize, test, securely erase, clone, etc.
• Ubuntu.com: Massively popular distribution of GNU/Linux based off Debian.