Apache is a free and open-source cross-platform web server software.
Drupal is a free and open-source web content management framework.
Leaflet is the open-source JavaScript library for mobile-friendly interactive maps.
OpenSSL is a software library for applications that secure communications over computer networks against eavesdropping or need to identify the party at the other end.
PHP is a general-purpose scripting language used for web development.
Unpkg is a content delivery network for everything on npm.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.