This makes me wonder how long until there is a project that tries to reimplement the ios libraries, similar to what GNUstep is doing for Cocoa.
http://www.google-melange.com/gsoc/project/google/gsoc2012/i...
"This proposal covers implementing a flexible animation API compatible with a certain popular existing desktop and mobile platform, as well as adding APIs compatible with a popular mobile platform. This will allow extremely user-friendly interfaces, as well as allow development or porting of applications that use CoreAnimation or UIKit API on platforms that don't yet support it."