• Unknown Worlds: Natural Selection   - The official home for the multiplayer sci-fi Half-life mod, Natural Selection.
  
  
• AbsolutSwede - Natural selection customization and skins. Site contains models, sounds and projects.
• Evolution - Contains news, members and downloads.
• Rattrap's Natural Selection Site - With Natural Selection related downloads, wav files, and information on the Half Life Sound Selector (HLSS).
• United Kingdom Natural Selection - News, articles, reviews and opinions.
  
  
• Natural Selection 2.0 (PC) - From Boomtown. Takes a closer look at the mod where aliens can eat people and where humans must prevent it. (August 4, 2003)

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