W3 Custom Product Options

Really good app, you can group functions by accordions. Great and fast technical assistance. 4 out of 5 stars because to change some things (ex. the color of the accordion bar) you have to modify the code of the theme (it would be better to have this option as a function of the app) but the assistance will help you out with this. With their help I managed to do that even if I don't have any knowledge about coding