Planet Half-Life - http://planethalflife.gamespy.com/ Resource includes files, forums, modifications, articles, and daily news.
Half-Life Prototype Developers - http://half-lifepd.planethalflife.gamespy.com/ User submitted articles on the Half Life series. Includes tutorials on server administration and mod development, and technical articles on the game engine.
Half Life Source - http://www.halflifesource.com/ Offers news, guides, screenshots and a forum.
Half-Life Portal - http://www.halflifeportal.com/ Includes guides, walkthroughs, reviews, and a forum. Also offers a media area with videos and screenshots.
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