Druplash is a MVC framework for Drupal. It is actually an adaptation of Mouf's Splash MVC framework. If you have a project developed with Splash, you can completely reuse your code, right into a Drupal installation.
To get started, you first need to set up your environment.
composer require mouf/integration.drupal.druplash ^8.0
Your packages are downloaded? Have a quick look at the installation guide.
Then, check the tutorial and learn how to create a controller, right inside your Drupal website!