Supposedly one that actually does work is the nipple stimulation but read into it on line (in how to do it) cuz it said if u over do it it makes ur contractions way more painful n longer. Just so u have an idea for how much to do it for. O also semen works also. There is someone in it that makes ur cervix start softening
The only one I know of with some amount of proof/evidence is nipple stimulation - it is much more likely to bring on contractions than if you don't do it. But you have to do it for like an hour and it can get pretty uncomfortable. I gave up after 5 minutes!
SUPPOSEDLY the following will help induce labor: Have sex, eat spicy food, eat a ton of pineapple, walking, take castor oil (I know there's more, I just can't think of them) .... But there's no proof that any of these methods actually work.