GameFAQs: Includes FAQs and guides, codes and secrets, game saves, reviews, message board, and general game information

Metroid: Official site for Metroid Fusion, Prime, and Zero Mission. Contains game overviews, details of items, equipment, and characters, and series history. Requires Flash

Metroid Database: Includes manuals, reviews, walkthroughs, maps, artwork, and FAQs for each title, news, fan works, and utilities