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.
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Why does Jotform don´t appear in Salesforce App Exchange?Asked by christian_alvarez_ on September 05, 2016 at 07:35 PM
I can see apps to create surveys like "Form assembly" but JotForm is not there.
I assume you were referring to this website https://appexchange.salesforce.com/popular
JotForm is not directly among the Apps but I see that if you searched it will recommend Zapier instead. It is because Zapier can be used also in integrating JotForm to Salesforce.
For direct integration process, you can refer to the user guide also.
Hope this help. Let us know if you need further assistance.