Apache is a free and open-source cross-platform web server software.
RxJS is a reactive library used to implement reactive programming to deal with async implementation, callbacks, and event-based programs.
WordPress is a free and open-source content management system written in PHP and paired with a MySQL or MariaDB database. Features include a plugin architecture and a template system.
WP Fastest Cache is one of a number of plugins for WordPress designed to accelerate the performance of your website.