2D or 3D graph created with Grapher, a graphing program included with Mac OS X; can create graphs from standard, logarithmic, and polar equations; includes zooming and animation capabilities.
The Grapher program is located by default in the /Applications/Utilities folder.
Program(s) that open gcx files
Mac: Apple Grapher
Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/gcx
