Formidable Forms is described as 'WordPress forms plugin. Over 200,000 professionals use our WordPress form builder to create contact forms, surveys, calculators, and more' and is a Form Builder in the office & productivity category. There are more than 10 alternatives to Formidable Forms for a variety of platforms, including Self-Hosted solutions, Wordpress, Online / Web-based, Mac and Windows. The best alternative is Forminator, which is both free and Open Source. Other great apps like Formidable Forms are Contact Form 7, Very Simple Contact Form, Torro Forms and MightyForms.
Contact Form 7 can manage multiple contact forms, plus you can customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and so on.
JetFormBuilder allows you to build any kind of form nice and easy. Its 18 field blocks allow you to create a form from scratch or reassemble the existing one. Throw JetStyleManager into the mix and you’ll be able to style every form field.