PhoneGap

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PhoneGap is the platform which you can install, PhoneGap Build is a web service to automate phonegap builds
You package html, css, js, images into zip and upload
Get back iOS, Android, WebOS, Blackberry, Symbian Binaries
Solves many of the phonegap setup hassles - still need to create (and upload) signing certificates for iOS/Android and use AppLauncher to upload iOS
http://build.phonegap.com
config.xml

Library to access to device specific features in javascript
Accelerometer - navigator.accelerometer.getCurrentAcceleration(accelerometerSuccess, accelerometerError);
Camera - navigator.camera.getPicture( cameraSuccess, cameraError, [ cameraOptions ] );
Media - var media = new Media(src, mediaSuccess, [mediaError], [mediaStatus]);
etc. http://docs.phonegap.com/en/1.7.0/index.html
Plugins - can do other stuff - send email, etc. - http://wiki.phonegap.com/w/page/36752779/PhoneGap%20Plugins