PhoneGap is a free open source framework which gives you access to native APIs. I’m working on a Windows station, but this can also be done on Linux and OSX. The main advantage to using web technologies with PhoneGap is that web designers and web developers can write HTML5, CSS and JavaScript code and still be able to build Apps for mobile devices without having to learn other programming languages such as C++, Objective C or JAVA. The best part is that you write code once and build for Android, iPhone, Blackberry, Windows Phone, WebOS, Symbian.