A Two-Dimensional Quality Mesh Generator and Delaunay Triangulator
Triangle generates exact Delaunay triangulations, constrained Delaunay triangulations, conforming Delaunay triangulations, Voronoi diagrams, and high-quality triangular meshes. The latter can be generated with no small or large angles, and are thus suitable for finite element analysis.
To install triangle, paste this in macOS terminal after installing MacPorts
sudo port install triangle