Stacker lets you drive your iOS application's navigation, page headings, nav buttons etc. all through how you declare your URLs. This makes iOS development easier and faster.
Unlike PhoneGap or Titanium, you can use Stacker in any regular XCode/iOS project. Jump back into native code when you need to.
Eg: A URL that will slide a new page overtop and set the title to 'Post' will look like:
Stacker was inspired by this post by @DHH: Hybrid sweet spot: Native navigation, web content.
Stacker provides you with features you might expect from a hybrid web/native iOS app.