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Nu is a programming language and supporting set of tools for writing shell scripts that make use of the Cocoa libraries. It supports the object-oriented message-passing syntax of Objective-C, albeit in a more concise form. Nu's main features include garbage collection, functions as first class objects and macros allowing for metaprogramming. The development team designed it under an open-source license with contributions from industry professionals and enthusiasts who continue to refine it on platforms like Mac OS X and Linux.

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