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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When you say "access", you meant opening the form in the form builder? Or just opening the form link to be filled it out?
If you are referring to sharing your form to them with the ability to edit and view the submissions of it, that can be possible by making your clients as sub account users. You can learn more about it here: https://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User. You can share specific forms to specific users with a specific set of permissions (edit or view only).
I hope that helps. Do let us know if I misunderstood your concern.