A list of jquery plugins I have worked with. I keep coming back to them because they are very effective. There are alot more outthere. Somemay even be better but these I can confirm works well.
Magnific Popup - https://dimsemenov.com/plugins/magnific-popup/ Use to create cool popups in your application.
jQuery LoadingOverlay - https://github.com/gasparesganga/jquery-loading-overlay Creates a loading overlay for you ajax operations
jQuery Confirm - https://craftpip.github.io/jquery-confirm/