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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 was testing the text tool but when adding a <button> it just submits the form and does not redirect to the linked URL so I guess this has been disabled or it never works before, but there is another way of redirecting visitor to other site, just use the "Thank you page" and select custom URL.
For more information about setting up thank page you may visit our guide in this link http://www.jotform.com/help/211-Setting-Up-the-Thank-You-Page.
For skip button you can use conditional logic to skip to a page. Let say you have 3 pages you can use conditional rule to allow function to skip to a certain page. Please see this guide for more info http://www.jotform.com/help/57-Smart-Forms-Using-Conditional-Logic.
You might want to try our form tabs widget so it will be easier for users to switch to a page back an forth.