PhoneGap is hybrid HTML5 mobile application framework which has nicely growing user community.
Here on HTMLCenter we have published several tutorials about designing and developing Cordova / PhoneGap based HTML5 mobile applications.
One of the main strengths of PhoneGap undoubtedly is the native plugin functionality. It allows developers to hook the native mobile OS components with HTML5 and JavaScript code. This way you can use JavaScript methods across the app to access functionality provided by native code.
In fact, any other developers using PhoneGap framework can just import your plugin and use the functionality in their own apps. Developer community has created many such plugins. And Cordova contributors have developed plugin manager called plugman in order to make installation of plugins simple.
There are several plugin repositories which collect and archive PhoneGap framework plugins.
While working with iOS and Android applications I have used several PhoneGap plugins and want to share some of them which helped me a lot in mobile app projects. Did I miss any good ones?