Soultanicals Slip N Slide Knot Proof Hair Glide. My braided sections of hair basically dread if I go a month without taking the braids down and re-doing them. That stuff cuts through the matting like nothing.
Also, nappyheadedjojoba on YouTube has a DIY detangler that alot of people love. I am actually going to try to make it this week.
Okra, slippery elm, marshmallow root and aloe vera gel (only use fresh in my opinion) are all slippery. So I am thinking that any product with, at least 2 of those ingredients may work.
I also find that most conditioners with bentrimonium methosulfate (I think that is right) and ceteryl alcohol help.