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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Yes you can capture signatures with JotForm. You can use Smooth Signature widget or E-Signature widget. Inside of this article you can see how to add widgets to your form: http://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form
We also have the Adobe eSign widget - which uses Adobe Document Cloud e-Sign Services (formerly echosign).
Hope this will help. Let us know if you need further assistance.