Apache is a free and open-source cross-platform web server software.
Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
Klarna Checkout is a complete payment solution where Klarna handles a store's entire checkout.
Magento is an open-source ecommerce platform written in PHP.
OptiMonk is an on-site message toolkit used to improve conversions using action-based popups ad bars.
PHP is a general-purpose scripting language used for web development.
RequireJS is a JavaScript library and file loader which manages the dependencies between JavaScript files and in modular programming.