Swastika is a free admin dashboard built with Bootstrap 4.
ModularAdmin is a free dashboard theme built on Bootstrap 4
Material admin template is absolutely free for commercial usage theme, that uses google's implementation of material design.
Dashboards by keen is an attractive collection of custom analytics dashboards that's ready to be shown to your team or your customers.
Sing App HTML5 Lite is a completely free and open-source admin dashboard template with stylish design.
Light Blue Dashboard Lite is a world first admin template with transparent design and deep background.
Carbon is a free admin template based on Bootstrap 4.
Vali is a free, modular and easy to customize admin theme built using Bootstrap 4, SASS and Pug.js.
Charisma is a Free, premium quality, responsive, multiple skin admin template.