Gabe Newell - Combine OverWiki, the original Half-Life wiki and Portal wiki

Revisiting Valve's The Orange Box, 15 years later

The Unseen Inbetween Variants of Dr. Breen and Alyx Vance : r/HalfLife

Tom Leonard - Combine OverWiki, the original Half-Life wiki and Portal wiki

Combine OverWiki

Half-Life Wiki:About, Half-Life Wiki

Loader - Combine OverWiki, the original Half-Life wiki and Portal wiki

Sent Marc another email about a supposedly cancelled EA Half-Life game. He responded in less than 10 minutes. : r/HalfLife

White Forest, Half-Life Wiki

Source, Half-Life Wiki

Jonathan Coulton - Combine OverWiki, the original Half-Life wiki and Portal wiki

Half-Life (series) - Wikipedia

Unforeseen Consequences - Combine OverWiki, the original Half-Life wiki and Portal wiki

Half-Life (Video Game) - TV Tropes

News - Kotaku

The Valve logo (2004 version)