The IMTEK Mathematica Supplement, or IMS for short is an open source Mathematica add-on and provides a wealth of packages and tutorials from a variety of application areas, but with a strong focus on Finite Element Computations. The IMS is a continuous project at the Chair for Microsystem Simulation, Department for Microsystem Engineering (IMTEK), University of Freiburg, Germany. Website (not Github like the main link).
This package contains routines and tools for obtuse angle shadowing networks and distance-based interpolation between scattered, multidimensional points. Four variants of distance-based interpolation can be compared with (coordinate-based) 2D Delaunay interpolation. The Obtuse package adds five interpolation methods to the Mathematica Interpolation command: Delaunay interpolation, Voronoi interpolation, Shepard interpolation, RBF interpolation, ObtuseAngle interpolation.