NinJutsu and Asian Culture Research Center
- Official branch of the Koka Ryu Ninjutsu School - Shiga Japan Asian Culture Research Center
- http://www.toushinkai.com/

Maai Hyoshi Ninjutsu Homepage
- Based in Auckland New Zealand, Maai Hyoshi Dojos teach traditional Ninjutsu and BJJ.
- http://www.ninjutsu.co.nz

Sato Ryu Ninjutsu
- 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.
- http://www.satoryuninjutsu.com

South African Ninjitsu Federation
- Ninjitsu ryu teaching the principles of Koga Ryu Ninjitsu. Lists style history, syllabus, organization profile, dojos and links.
- http://www.sanf.co.za

Rick Tew's Martial Science
- Articles, training videos, and seminars dealing with Tew Ryu Ninjitsu, an American ninjitsu system in a non-traditional program. Also sells martial arts supplies.
- http://www.totalwarrior.com/