PhoneGap - Deploy your app to Multiple Platforms

PhoneGap is an HTML5 app platform that allows you to author native applications with web technologies and get access to APIs and app stores. PhoneGap leverages web technologies developers already know best... HTML and JavaScript.

With PhoneGap you can:

• Take advantage of HTML5 and CSS3
• Use JavaScript to write your code
• Access Native Features
• Deploy your app to Multiple Platforms

Also, Nitobi -  the owner of PhoneGap, was aquired by Adobe. That means:
"This acquisition will allow Nitobi to focus solely on PhoneGap and work with Adobe to offer developers more efficient, expressive design and development across devices with HTML5, CSS and JavaScript. By joining forces with Adobe, we’ll be able to offer even more innovative applications across platforms and devices, with greater reach."