MaterialPro Admin is a popular open source WebApp template for admin dashboards and control admin panels. Monster is fully responsive HTML template, based on the CSS framework Bootstrap 4 Beta. It utilizes all of the Bootstrap components in its design and re-styles many commonly used plugins to create a consistent design that can be used as a user interface for backend applications. MaterialPro Admin is based on a modular design, which allows it to be easily customised and built upon.
Demo: https://themeforest.net/item/materialpro-bootstrap-4-admin-template/20203944