Apache is a free and open-source cross-platform web server software.
Debian is a Linux software which is a free open-source software.
Flickity is a JavaScript slider library, built by David DeSandro of Metafizzy fame.
Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
Google Analytics is a free web analytics service that tracks and reports website traffic.
Gravatar is a service for providing globally unique avatars.
JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PHP is a general-purpose scripting language used for web development.
Unpkg is a content delivery network for everything on npm.