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cocoaNEC is a Mac OS X application for designing and modeling antennas. As indicated by the name, cocoaNEC uses the Cocoa framework of Mac OS X. The application is free and it can be downloaded from the Download page. The Xcode project with the cocoaNEC sources can also de downloaded from the same page. For non-commercial use, the source code for cocoaNEC is free. Except for the graphics elements, the Tiger version of cocoaNEC uses multiple cores of a processor only when modeling an antenna at multiple frequencies. The Snow Leopard version will use multiple cores for other parts of NEC-2 that are compute intensive.