"Modern HTML rendering engines and emerging standards make it possible to create a new class of rich experiences that could previously be achieved only with native development toolkits—but developers need better Web development frameworks and authoring tools in order to take advantage of the possibilities. Three new open-source software projects developed at Motorola Mobility hope to address the problem. We—Tim Statler, Zachary Cohen, and Kris Kowal—have had the pleasure of working on a new content creation tool called Ninja, a JavaScript development framework called Montage, and a testing automation tool called Screening. In this article, we will describe all three pieces of software, and we've included code examples to illustrate some of the functionality. But first—a high-level overview..."