My best two for free spins are on Microgaming.
The first one is Ho Ho Ho, and the second one is Twister
. They are both for 20 free spins, and can be re-triggered, which is where I always have my luck here.
On these two games I have re-triggered up to 160 spins.
I do the best when it is set on .02 but when that runs dry change it to another demomination. I have won quite a bit of money here...then spent it...hehe