NACA, a C++ library which can take the parameters of certain NACA airfoils and return the coordinates of a sequence of points that outline the wing shape. The data can be displayed with gnuplot.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
NACA is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.
gnuplot_test, C++ programs which illustrate how a program can write data and command files so that gnuplot can create plots of the program results.