try https://fabform.io for the forms backend

if you need to add some static website forms to your site check out fabform.io

That was a good article all about static website forms

create a static website with contact form on github pages

Try this, if you need to add gitlab pages forms to your gitlab pages website.

create a static website with contact form on github pages

A very good article about static website forms

Thanks for doing a review on static website forms

Great article. Just want to add, if you are using Hugo to create a static website, you can get some great free hugo themes here that use static website forms from fabform.io built in.