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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I'm not very familiar with Webflow but based on some previous threads I found you should be able to do this. We have many embed methods but according to what I am seeing the iframe code would work best it seems. To use it you will need to add it anywhere html is accepted on your pages.
If you have any trouble with it though just let us know and we'll gladly guide you furthermore.
So far I found this http://help.webflow.com/site-settings/custom-code where I believe might be to embed your jotform but I'm not entirely certain just yet.
Feel free to play around with it more and if you get stuck just ask and we'll test it out furthermore since it will take me some time to try to figure this out more anyhow.