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.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I have moved your new question on this thread to avoid creating new topic on the same thread.
Anyway, google site runs over SSL and it is required by their platform. That's the main reason why the Google Site embed code defaults to secure (SSL) embed code. However, you can still embed non-SSL form by following this guide.
1. Go to your Google Site.
2. Switch to Edit mode.
3. Click "Insert Menu" and select "More gadgets" at the bottom.
4. Select "Embed Gadget".
5. Put your form's iFrame embed code (since it's iframe, you can choose to take SSL or non-SSL). Then adjust the gadget width and height so it fits on your form.
If you need further assistance, do let us know.