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 it is possible. We have an app that lets you prepopulate the form fields. Please check this app: http://apps.jotform.com/app/field_prepopulator
If you want to put default values on the fields you can try these steps:
1. On the Form Editor, select the field label.
2. Click on "Properties"
3. Then select "Default Value"
4. Put the "Value" then press "OK" button.
I hope this helps. Let us know if you need any more help.