Impel : Impel takes the pain out of working with HTML5 asynchronous databases.
Statement callbacks? Transaction callbacks? One-to-many and many-to-many relati...
Prototype : Easy Ajax and DOM manipulation for dynamic web applications
Protovis : Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for vi...
Rickshaw : Rickshaw is a JavaScript toolkit for creating interactive time series graphs.
impress.js : It's a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com
ActiveJS is a JavaScript application framework that provides local and REST based data modeling and pure DOM view construction with back button and history support.