JSN PageBuilder, built by JoomlaShine, is one of the more popular Joomla Page Builders.
As with all Page Builders, we have a visual drag and drop layout editor for constructing pages. The extension comes with some 30 elements such as tabs, lists and images, and offers responsive controls to test and tailor the layouts for various devices and viewport sizes.
They do offer a free version, but it's not licensed to be used on a live site, so only practical for testing the extension out. The two paid licenses are Individual and Developer, Individual being licensed for a single site, and Developer for unlimited web sites.