It's not quite what you describe, but Ivan Vučica is currently working on a GSoC project to implement a subset of UIKit with parts of Quartz and CoreAnimation i

It's not quite what you describe, but Ivan Vučica is currently working on a GSoC project to implement a subset of UIKit with parts of Quartz and CoreAnimation in GNUstep. http://www.google-melange.com/gsoc/project/google/gsoc2012/ivucica/11001 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."