Tranquil is an open source ABI compatible with Objective-C programming language built on top of the Objective-C runtime.
Tranquil aims to provide a more expressive and easy to use way to write Mac OS X (and soon, iOS) apps.
However, Tranquil is still extremely experimental and you shouldn't use it for anything other than fun for now.
Detailed instructions on how to build / run Tranquil are available HERE and you can go HERE to learn more about it.
Here are some key features of "Tranquil":
· Compatibility with C/ObjC headers, meaning that there is no need to create special bindings for C APIs.
· Automatic memory management.
· Dynamic Typing.
· Language level concurrency support.
· String interpolation.
· Multiple assignment.
· Message cascading.
· Good performance, even at this extremely early stage.
· Apple Xcode