Elementor is the most popular WordPress page builder. There is a free version and a premium Pro version. Elementor Pro includes a Theme Builder, a Form Builder, and a Popup Builder. The theming features are easy to use. You can create singe and archive templates as well as headers and footers. The theming features work with most themes. The theme building feature allows you to use dynamic data and custom fields in your templates. You can create templates for Custom Post Types.