Raspberry leaf tea doesn't induce labour, it tones the uterus, so when you are in labour, contractions are meant to be stronger, thus reducing time in active labour.
Dates ripen the cervix, but you need to eat about 8 delegat noir dates or 3 medjool dates every day for 4 weeks before your due date. Some people say that eating loads in one day will induce labour, but that's probably the laxative effect.
Spicy food works the same way- the bowels contract due to the spice, causing your uterus to also contract.
Castor oil can do the same BUT IT IS NOT RECOMMENDED!
Curb walking, walking sideways up stairs, lunges, etc are meant to help position the baby's head further down, thus triggering labour as the gravity and the rocking motion are meant to encourage baby to fall further down.
Pineapple core contains bromelun, an enzyme that effects the cervix. Some people swear by eating pineapple.
Putting 2 pierced evening primrose capsules up your vagina and sperm (so have sex) is also meant to soften the cervix.
At the end of the day, these things may help, or may just be coincidental, but the baby comes when it's fully developed and then releases a hormone which then triggers labour.
Sit tight, enjoy your last few days and fingers crossed that your baby comes soon. Good luck!