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I see that on their website, they are still hosting data about the integration so I would suggest to contact them to see why the app / integration is no longer available.
This is the link to the mentioned page: http://fudok.com/en-home/how-does-to-works/jotform-integration
You can contact them by going here: http://fudok.com/en-contact
Since the app is theirs, they can decide to remove it, but it might have also been a mistake so letting them know should either resolve the issue for you or give you some details as to why it is no longer available.
If it is not going to be available do let us know and we will see if there is anything that we can do to help.