FNGraph
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FNGraph is a freeware application for graphing mathematical functions. The latest stable version is 2.61.
FNGraph allows the graphs and coordinate systems to be modified, as well as letting the user define his or her own variables. Any function can be evaluated for (X, Y) at any point and analyzed for precision. Tracing the graphs can be done manually or may be viewed by using the keyboard's arrow keys.
Documents in FNGraph are saved as .fng files.
The developer of FNGraph is Alexander Minza.