Popular GPL plugins and themes offer a wide range of WordPress functionality and design options, all under the General Public License. These products allow users to modify, distribute, and use them freely, with many offering advanced features like SEO optimization, performance enhancements, eCommerce support, and page-building tools. Well-known GPL plugins include options for form-building, security, and analytics, while themes provide responsive, customizable designs suitable for blogs, business sites, and online stores. While these GPL products offer affordability and flexibility, they often come without official support or updates from the original developers.