A CMS (Content Management System) is a software application that allows users to create, manage, and publish digital content, typically on websites. There are several popular CMS frameworks available, including Laravel, Magento, Drupal, WordPress, and OpenCart.

1. Laravel: Laravel is a popular PHP framework that is well-suited for building custom CMS solutions. Laravel provides a robust set of features that make it easy to build scalable and maintainable applications, including a powerful routing system, a flexible database layer, and a templating engine. Laravel also has a large and active community, which means that there are many resources available for developers who are building custom CMS solutions using this framework.

2. Magento: Magento is an e-commerce platform that is designed to help businesses build and manage online stores. Magento includes many features that are specific to e-commerce, such as support for multiple payment gateways, inventory management, and order fulfillment. Magento also has a large and active community, which means that there are many resources available for developers who are building custom e-commerce solutions using this framework.

3. Drupal: Drupal is a popular open-source CMS that is known for its flexibility and extensibility. Drupal includes many features that are common to CMS platforms, such as content management, user management, and workflow management. Drupal also includes a powerful module system that allows developers to add custom functionality to the platform.

4. WordPress: WordPress is a popular open-source CMS that is well-suited for building websites and blogs. WordPress includes many features that are specific to publishing content online, such as support for blogging, social media integration, and search engine optimization. WordPress also has a large and active community, which means that there are many resources available for developers who are building custom CMS solutions using this platform.

5. OpenCart: OpenCart is an open-source e-commerce platform that is designed to help businesses build and manage online stores. OpenCart includes many features that are specific to e-commerce, such as support for multiple payment gateways, inventory management, and order fulfillment. OpenCart also includes a powerful module system that allows developers to add custom functionality to the platform.

Overall, each of these CMS frameworks has its strengths and weaknesses, and the choice of which one to use will depend on the specific needs of your project. If you are looking to build a custom CMS solution, it is important to consider factors such as scalability, extensibility, ease of use, and community support when selecting a framework to use.