Phoenix is a super-slick Libretro frontend powered by Qt 5, and is available on Windows, OS X and Linux. Dead-simple to use, Phoenix features both a powerful library system to organize your classic game collection, along with a set of up-to-date emulators to play them right within the app!
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http://phoenix.vg/They are in need of developers of all types to assist on the project, whether you're a C/C++ programmer, Qt expert, web designer, UI designer, or even a proofreader, they need you!
Please contact them via IRC at #phoenix-dev on Freenode or contact athairus via email (he's on gmail under that name!)