Websites can use protocol handlers to provide a convenient way for users to open default applications directly from a web page. In Drupal you can add such handlers to the list of allowed protocols, e.g. in order to create a link for your visitors to directly call you by skype.
Drupal
The enterprise OpenSource content management system which is available for free at https://www.drupal.org where you can find all the details and also references.
Drupal has a very active community with tens of thousands of developers all around the world and they also have a huge focus on standard compliance and on security.
As a team that had spend time and money for years in developing best practices for staging,
Drupal 8 projects are in most cases controlled by