Table of contents:
jQuery Dialog Plugins:
Bootbox is a tiny jQuery plugin for creating alert, confirm and flexible dialog boxes using Twitter's bootstrap framework.
SweetModal is a simple, sweet, customizable, animated jQuery modal plugin used to replace the default alert / prompt / confirm dialog boxes.
Zebra_Dialog is a small (4KB minified), compact (one JS file, no dependencies other than jQuery 1.5.2+) and highly configurable dialog box plugin for jQuery.
jConfirm is an easy, customizable jQuery dialog box alternative plugin which enables to create nice alert, confirm, and prompt boxes with cool CSS3 powered animations.
Vanilla JS Dialog Plugins: