Splines Package
As of Version 7.0, some of the functionality of the Splines Package is now built into the Wolfram Language kernel. »
SplineFit — fit a spline to a set of data
SplineFunction — parametrization of the spline returned by SplineFit
Spline — spline graphics object
Spline Types
Bezier ▪ CompositeBezier ▪ Cubic