Traditional Japanese Bujutsu:Frank Nilden provides a listing of the names of many Ryu Ha. Similar to Bugei Ryu Ha Daijiten in English.
Koryu.com: Martial arts of the Japanese samurai. Photos, articles, and book reviews on authentic Koryu Bujutsu (classic samurai martial arts).
Secrets of Shuriken: Information on Shuriken (Japanese blade throwing). Details history, techniques, training and legal issues.
Tenshin Shoden Katori Shinto Ryu Bujutsu: One of the oldest extant martial art systems in Japan.