ClassyBox is a jQuery plugin that is a complex LightBox alternative with support for the most popular video services, enabling you to embed a media gallery on your site.
Vegas is a jQuery plugin to add beautiful fullscreen backgrounds to your webpages. You can even create amazing Slideshows.
Boxer is a quick and simple way to display images, inline-content or iFramed URLs in a lightbox-style modal.
The jQuery BlockUI Plugin lets you simulate synchronous behavior when using AJAX, without locking the browser. When activated, it will prevent user activity with the page (or part of the page) until it is deactivated.
BlockUI adds elements to the DOM to give it both the appearance and behavior of blocking user interaction.
Simple Modal is a small plugin to create modal windows. It can be used to generate alert or confirm messages with few lines of code.
Simple Modal is not a lightbox although the possibility to hide parts of its layout may partially make it similar.
jQuery.fluxoModal is a jQuery plug-in similar to lightbox. It can highlight any kind of html element inside an html modal window, blurring the background using html5 canvas, CSS3 animations and a crossbrowser fallback for IE.
Also Picbox WordPress plugin is now available.
By combining support for a wide range of media with gorgeous skins and a user-friendly API, Lightview aims to push the Lightbox concept as far as possible.
ChillBox is a simple, unobtrusive script used to overlay images on top of the current page inspired by Lightbox.
Unlike other lightbox versions, ChillBox does not require the use of images for buttons and is fully rendered using jQuery. ChillBox is fully customisable and you can change the range of options to create a unique version of ChillBox that works with a website theme.
Avgrund is a jQuery plugin for modal boxes and popups. It uses interesting concept showing depth between popup and page. It works in all modern browsers and gracefully degrade in those that do not support CSS transitions and transformations (e.g. in IE 6-9 has standard behavior).
Freeow! is a plugin for making Growl-like alerts or message boxes on your website. You can customize the look and animation of Freeow! each time a message box appears, and you can alter other options such as whether or not to have the message box hide itself automatically.