Does Gravity Forms enroll members in a WooCommerce Membership?
I’m not sure. Have you already tried it?
Gravity Forms User Registration will register a WordPress user. If a WooCommerce Membership user is a WordPress user as well, then you can make the two work together. You may have to store some custom user meta so that WooCommerce Membership knows the membership information for the registered user.
I recommend registering a user via whatever method WooCommerce Membership uses currently, then checking the wp_user table and wp_usermeta table to see what information was written. Then make sure that the Gravity Forms User Registration feed stores the same information in the same places and in the same format.
This is now possible via Uncanny Automator.