1) RoyalUI Admin
RoyalUI is a free and open template designed to give your product the snazzy, super intuitive interface you have been looking for.
Built with the latest version of Bootstrap, CSS, HTML5, jQuery and SASS,
this admin template boasts an excellent documentation, high responsiveness and clean code.
Link: https://www.templatewatch.com/
Demo: https://www.templatewatch.com/royalui/template/index.html
2) ModularAdmin: Free Bootstrap 4 Dashboard Theme
ModularAdmin is an open source dashboard theme built in a modular way. That makes it extremely easy to scale, modify and maintain.
Github Link: https://github.com/modularcode/modular-admin-html
Demo: https://modularcode.io/modular-admin-html/
License: MIT License
3) SB Admin
A Bootstrap 4 admin theme with powerful jQuery plugins to extend the functionality of the Bootstrap framework.
Link: https://startbootstrap.com/template-overviews/sb-admin/
Demo: https://blackrockdigital.github.io/startbootstrap-sb-admin/
License: MIT license.
4) Core UI
The only Bootstrap Admin Template you need to create amazing user interfaces. CoreUI is an open source Bootstrap 4 based admin template.It has support for: AngularJs, Angular 2 +, Vue Js, React Js
Link: http://coreui.io/
Demo: http://coreui.io/demo/Static_Demo/
License: MIT-style License.
5) Bootstrapious Admin Dashboard
It is a dashboard/admin template and contains 6 responsive HTML pages.
Link: https://bootstrapious.com/p/bootstrap-4-dashboard
Demo: http://demo.bootstrapious.com/dashboard/
License: Bootstrapious license. You can use it freely with attribution to their link.
6) Bootstrapious Material Admin
Bootstrap 4 Material admin is a free Bootstrap 4 admin template. Its UI and design was inspired by Google’s Material design framework.It contains 6 HTML page templates, all of them in 6 colour variants.
Link: https://bootstrapious.com/p/admin-template
Demo: http://demo.bootstrapious.com/admin/
License: Bootstrapious license. You can use it freely with attribution to their link.
7) Bootstrapdash Star Admin - Super Responsive Free Bootstrap 4 Admin Dashboard Template
Star Admin Bootstrap 4 Admin Template has an excellent Dashboard with all the necessary bars, graphs, charts and data tables. To back them up, it has different custom plugins, integrated maps, and social media counter integration. It’s sample pages and various UI features will definitely make your experience enjoyable. Fully working forms, attractive widgets, testimonial section make it even more useful.
GitHub Link: https://github.com/BootstrapDash/StarAdmin-Free-Bootstrap-Admin-Template
Demo Link: http://www.bootstrapdash.com/demo/star-admin-free/jquery/src/demo_1/index.html
License: MIT