Use a third-party CSS or JS Framework, a self-hosted service like a CRM, or a third-party service with the site.
This Hebrew Calendar module is based on the widely used "Calendar" module which is commonly used to create monthly calendars.
Building interactive dialogues for facebook bot messenger.
Drupal Bot Builder is bridge between Drupal and Facebook for site-builders
This project integrates Drupal with QuickWeb system maintained as Westpac Australia hosted payment gateway.
This is simple module for Drupal 8 for basic integration with Shareaholic (https://shareaholic.com/) and output in node.