Use a third-party CSS or JS Framework, a self-hosted service like a CRM, or a third-party service with the site.
For D7: Use Moneris payment gateway with the Payment module (https://www.drupal.org/project/payment)
Affiliates Connect Flipkart is the Plugin to the Affiliates Connect Module.
React progressively decoupled Calendar based on JSON API.
This module provides a form block displaying an email field to subscribe to a Sarbacane list.