DXTREME from DevExpress. For US$899, it sells itself as enabling you to create hybrid apps for iOS, Android, Windows 8 and the web all in one toolset with a single codebase. While this is not necessarily something new, DevExpress does more than just cross compilation taking it further by also augmenting your app’s design so that you can create native looking apps for each platform without having to do so much heavy lifting. One codebase, but your iOS app look like a cocoa-touch interface, and your Android app follows similar modern droid device specific design patterns.
Mobile, Tablet and Desktop Development All at The Same Time - CodeProject