You can visit www.GrottoCenter.org without any login/password as an invitee and access more than 14000 caves worldwide. However, if you want to access all the 26000 caves of the database, you will need to register to GrottoCenter. With an account you will also be able to edit/create new caves, add comments, save all the caves you already explored and much more ;)
Vincent has just set up a service that makes it easy to download all Grottocenter data. This takes the form of a compressed file which contains a json file per type of data (inputs, cavities, organizations, massifs, documents). The update is carried out once a month. This service is accessible to members of the Wikicaves association and partner organizations. If you are interested in this service, do not hesitate to contact us .