Formidable Forms

Formidable Forms is a WordPress plugin with a drag-and-drop form builder and advanced features like conditional logic, mathematical calculations, and file uploads. It also handles e-signature capture and integrates with payment processors. Forms can be embedded on pages or published as standalone pages.

Works well for WordPress users who need more than basic contact forms. Compared to Ninja Forms, Formidable includes more sophisticated automation rules and financial processing features, though both run on your own server.