A few other styles found within the Bujinkan dojo (Yoshin ryu already mentioned by Setsu):
Gyokko ryu
Kosshijutsu/shitojutsu
Formalized by Sakagami Kunishige in the mid-16th century
Koto ryu
Koppojutsu, kenjutsu, shurikenjutsu
Also formalized by Sakagami Kunishige in the mid-16th century (the two were inherited by Momochi Sandayu and passed down together through the Toda family. The two schools compliment each other.
Ueno Takashi and Fukumoto Sensei (Kaden Koto Ryu) both claim to be soke of this school in addition to Hatsumi Masaaki.
Shinden Fudo ryu
Taijutsu (dakentaijtsu, jutaijutsu), iaijutsu/battojutsu, bisento, o-ono (great axe)
Supposedly formalized by Izumo Yoshitero (who also founded Kukishinden ryu) in the early 12th century. One of the earliest examples of iaijutsu, which is hidden in its jujutsu.
Gikan ryu
Koppojutsu
Uryu Gikanbo founded this in the late 16th century. The densho only lists kata by name, the teachings are purely oral tradition and rarely taught. I've seen only a couple technique from it. They friggin hurt.
We of course have the three ninjutsu ryu. There is a lot of conjecture about the legitimacy of these arts. It is not unreasonable to me that the teachings of these arts are at the very least a synthesis of strategies and tactics found within other systems. Kukishin ryu appears to have quite a bit on invisibility, disguise, espionage, scouting, military strategy, the use of fire and water, and fortress construction (and hence their weaknesses). Gyokko ryu and Koto ryu both came to the Toda family by way of Momochi Sandayu, a famous Iga ninja, and all three ninjutsu ryu demonstrate influences by one or both of these styles.  |