ng-busy
Show busy/loading indicators on any promise or subscription
ngrx-busy
Show busy/loading indicators on any observable or promise
busyness
This is a loaders library for Angular 6+, it's based con loaders.css, so, you'll dispose of many beautiful loaders out of the box; however, busyness give the chance to make your very own custom component to be shown when the web app it's "busy".