1. Laravel
This is the best php-framework for new projects, web-sites, internet stores and other network projects.
The GitHub page of Laravel from where you can download and see the project code is: https://github.com/laravel/laravel
2. Symfony
Another PHP framework for web applications is Symfony. It is used by thousands of web applications (including BlaBlaCar.com and Spotify.com) and most of the popular PHP projects (including Drupal and Magento).GitHub Stars: 17.8k+
The GitHub page of Symfony from where you can download and see the project code is: https://github.com/symfony/symfony
3. Composer
Composer helps you declare, manage, and install dependencies of PHP projects.
GitHub Stars: 14.9k+
The GitHub page of Composer from where you can download and see the project code is: https://github.com/composer/composer
4. PHPMailer
PHPMailer is the best php library for sending email. Supports many mail servers including Gmail.
The GitHub page of PHPMailer from where you can download and see the project code is: https://github.com/PHPMailer/PHPMailer