Soft UI Dashboard - Admin dashboard template for Bootstrap 5
Bootstrap Zero - Open-source, free Bootstrap templates collection.
PlainAdmin - PlainAdmin is an Open-source freemium Bootstrap 5 based vanilla JS multipurpose admin template comes with - all essential dashboard components, pages, UI elements, charts, graphs, libraries and everything you may need for a data-rich backends.
Bootstrap Magic - Create your Bootstrap 4.0 themes easily with magic
ArchitectUI - Modern dashboard template for bootstrap 4
Material Design for Bootstrap 4 - Powerful and free UI KIT for the newest Bootstrap 4 and Material Design