AddToAny is a universal sharing platform that can be integrated into a website by use of a web widget or plugin.
Drupal is a free and open-source web content management framework.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
OpenStreetMap is a free, editable map of the whole world that is being built by volunteers largely from scratch and released with an open-content license.
PHP is a general-purpose scripting language used for web development.