Emoticons.js is a jQuery plugin to insert emojis, font smileys, embed videos (youtube/vimeo), media files,pdf and highlight code syntax.
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.
FitVids.JS is a lightweight, easy-to-use jQuery plugin for fluid width video embeds.
rlightbox is a jQuery UI mediabox that can display many types of content such as images, YouTube and Vimeo videos. It has many unique features like Panorama and Live Re-size. Like other jQuery UI widgets, it is ThemeRoller ready.