Impel : Impel takes the pain out of working with HTML5 asynchronous databases.
Statement callbacks? Transaction callbacks? One-to-many and many-to-many relati...
Bliss.js : Want to use Vanilla JS but find native APIs a bit unwieldy? Bliss is for you
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...
jQuery : The Write Less, Do More, JavaScript Library
Prototype : Easy Ajax and DOM manipulation for dynamic web applications
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.