MovingAverage — find the simple moving average with any span
ExponentialMovingAverage — find the exponential moving average with damping
MovingMedian — find the moving median with any span
Interpolation — find an interpolation of any order in any number of dimensions
FindFit — find a constrained nonlinear fit to data
ListConvolve,
ListCorrelate — convolve or correlate data with any kernel
CellularAutomaton — apply a cellular automaton rule in any number of dimensions
Fourier,
InverseFourier — discrete Fourier transform and inverse