Best for developers and businesses requiring a flexible, open-source content management system. USP: Joomla is a highly customizable content management system (CMS) that enables users to build complex websites and online applications. With its open-source nature, Joomla offers flexibility, allowing developers to create tailored websites with advanced features. It supports extensions for eCommerce, SEO, social networking, and more. Joomla’s robust security and large community support make it a great choice for users looking for a highly customizable platform.