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. 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.
Lots of ready to use plugins.