http://www.appcelerator.com/• Appcelerator Titanium is a free and open source framework to develop easily native mobile and desktop apps with web technologies. It provides developers with over 100 customizable UI controls for native tables, views, tabs, alerts, dialogs, buttons, support for geolocation, social networks and multimedia.
http://sproutcore.com/• Sproutcore Touch is the touch edition of the Sproutcore framework for developing HTML 5 web applications that includes complete support for touch events and hardware acceleration on the iPad and iPhone.
http://rhomobile.com/• Rhodes is another excellent open source framework to rapidly build native apps for all major smartphone operating systems (iOS, Windows Mobile, Symbian and Android). It supports GPS geolocation, PIM contact reading and writing, and camera image capture.
http://snippetspace.com/• iWebkit 5 is the new version of the popular ultralight framework for easily creating iPhone and iPod touch applications. The current release has new improved features and is really easy to understand in order to develop in just a few minutes your own web apps.