Formidable Forms is a powerful WordPress plugin that allows users to create advanced forms with ease. It offers a drag-and-drop interface for building contact forms, surveys, quizzes, and more. With a focus on flexibility, Formidable Forms supports features like conditional logic, multi-page forms, and integration with various third-party services. The plugin is available in both free and premium versions, with the premium version offering advanced features like reports, form templates, and integrations. Some third-party sources offer Formidable Forms under the GPL (General Public License), but these versions may not include official support and updates.