Based in Wausau, Wisconsin. Martial arts as a tool for self-protection and a vehicle for personal development. Class information, instructor bios, and articles.

Articles, training videos, and seminars dealing with Tew Ryu Ninjitsu, an American ninjitsu system in a non-traditional program. Also sells martial arts supplies.

Ninjitsu ryu teaching the principles of Koga Ryu Ninjitsu. Lists style history, syllabus, organization profile, dojos and links.

Information central for modern day shadow warriors. Technique lists, training and history information. Associated with the Black Dragon schools.

Information on both traditional and non-traditional types of Ninjutsu, Jujutsu, Aikijutsu and Capoeira. Contains dojo details, locations, events, seminars, instructor profiles, photo gallery, links and store.

Sato Ryu Koga Ryu Ninjutsu. Authentic Koga Ryu Ninjutsu Instruction by the Soke of the Sato Ryu, Soke Yo Hiroshi Sato. Son of Kenneth Sato also known as Toshitori Yamashiro a Koga Grandmaster.

Based in Auckland New Zealand, Maai Hyoshi Dojos teach traditional Ninjutsu and BJJ.

Ninjutsu training curriculum, history, free magazine, international training centres and technique lists.

Official branch of the Koka Ryu Ninjutsu School - Shiga Japan Asian Culture Research Center