GPT-4 gives me this:

Certainly, there are numerous popular and well-maintained PHP projects that have had a significant impact on the web development landscape. Here are a few notable ones:

WordPress:

Description: WordPress is a free and open-source content management system (CMS). It allows users to create and manage websites easily without requiring extensive programming knowledge.

Impact: WordPress powers over 40% of the web, making it the most popular CMS in the world. Its plugin and theme ecosystem allows for a high degree of customization, catering to virtually all website needs.

Laravel:

Description: Laravel is a modern PHP framework that provides a clean and elegant syntax, making web application development enjoyable and truly fulfilling. It handles many of the web project necessities such as routing, caching, authentication, and more.

Impact: Laravel has garnered a massive community due to its ease of use, comprehensive documentation, and the ecosystem it provides (like Laravel Echo, Horizon, Nova, and more).

Symfony:

Description: Symfony is a set of PHP components and a web application framework. It's known for its stability and being extensible. It’s also the foundation behind many other popular PHP projects.

Impact: Aside from its own extensive community, many other projects (like Laravel) are built upon Symfony components, showcasing its robustness and versatility.

Composer:

Description: Composer is a dependency management tool for PHP. It allows developers to declare the libraries on which their project depends and it will manage the installation and updating of those libraries for them.

Impact: Almost every modern PHP project uses Composer. It has revolutionized how PHP developers manage dependencies and share code.

phpBB:

Description: phpBB is a free and open-source forum software that offers extensive customization options through its mod and theme systems.

Impact: It's one of the most popular forum platforms and has been used by countless communities across the web.

Magento:

Description: Magento is an open-source e-commerce platform. It offers a high degree of flexibility and control over the look, content, and functionality of an online store.

Impact: It's a leading e-commerce solution that has powered many successful online stores and has a vibrant extension ecosystem.

Drupal:

Description: Drupal is a free and open-source content-management framework. Like WordPress, it's used for building websites but is known for its flexibility and scalability.

Impact: Many government and large-scale websites around the world use Drupal due to its robustness and extensibility.