History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. It supports jQuery, MooTools and Prototype.
Paper.js is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas.
It offers a clean Scene Graph / Document Object Model and a lot of powerful functionality to create and work with vector graphics and bezier curves, all neatly wrapped up in a well designed, consistent and clean programming interface.
An enhanced HTML 5 file input for Bootstrap 3.x with file preview for various files, offers multiple selection, and more.
The plugin allows you a simple way to setup an advanced file picker/upload control built to work specially with Bootstrap CSS3 styles. It enhances the file input functionality further, by offering support to preview a wide variety of files i.e. images, text, html, video, audio, flash, and objects.
TabbedContent is a lightweight tabs plugin that uses the HTML5 history API to add your tab navigation to your browser's history. Also it is compatible with Bootstrap.
jQuery.filer is a simple HTML5 File Uploader, a plugin tool for jQuery which change completely File Input and make it with multiple file selection, drag&drop support, different validations, thumbnails, icons, instant upload, print-screen upload and many other features and options.
Blockrain.js is a tetris game in HTML5 for jQuery with autoplay. It's responsive and you can customize colors.
A tutorial about how to create a gorgeous, interactive animated pie chart by using HTML5 canvas element, CSS3 and jQuery.
ClassyCountdown is a jQuery plugin that allows you to easily create clean circular countdowns. It is fully customizable and includes 12 themes, which can be modified and it uses HTML5 canvas for rendering the circles.