Use a third-party CSS or JS Framework, a self-hosted service like a CRM, or a third-party service with the site.
Webform Conversion-Tracking provides the ability to execute custom JavaScript on the webform confirmation page, typically used for conversion tracking.
Provides an endpoint for Storybook JS to render Twig templates directly with Drupal.
Search API tracking via (currently) DB storage. The storage is swappable if needed.
This module provides a Twig extension that enables you to generate charts in Twig using that Charts module API.