What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I'm not sure to which plugin specifically you're referring, but all widgets and integrations are free of use from our side, only what can involve paying sort to speak are integrations, since some other accounts that you would like to integrate require to have paid account and widgets (API limits) you can check more here about API.
You can give us more information about what would you like to do so we can provide a more precise answer.