Viz Communications
Publishes anime and manga in the USA. Titles include Ranma ½, Shonen Jump, Animerica Extra, Dragon Ball, and Pokémon.

TokyoPop
Publisher of FRUITS BASKET, LOVELESS, PRINCESS AI, D.N.ANGEL, .hack and many more. The site also provides free Manga magazine, manga pods and previews, up-to-the-minute manga news, and the national Rising Stars of Manga competition.

Shogakukan
Japanese publisher of dictionaries, education, and other literature, including manga.