Otogakure Village Exclusive Jutsu/Equipment List

Canon Techniques:

Leech All Creation: Attack Prevention Technique
Mind's Eye of the Kagura
Soft Body Modification
Edo Tensei
Body Flame
Summoning: Rashomon (plus variants, clearly)
Orochimaru's Juuinjutsu (others could make their own curse seals with the correct application of custom technique, but Orochimaru's would specifically be Oto-exclusive)
Magic Lantern Body Technique
Chidori Katana
Chidori Senbon
Chidori Stream
Chidori Sharp Spear

Canon Equipment

Kusanagi no Tsurugi