Methods for STEM Undergraduate Fortran code for the numerical differentiation of a function using Neville's process to extrapolate from a sequence of simple polynomial approximations. NAG Library numerical differentiation routines http://graphulator.com Online numerical graphing calculator with calculus function. Boost. Math numerical differentiation, including finite differencing and the complex step derivative Complex Step Differentiation Differentiation With(out) a Difference by Nicholas Higham, SIAM News. findiff Python project Numerical analysis Differential calculus