An interactive applet showing several triangle centers that lies on the Euler line. "Euler Line" and "Non-Euclidean Triangle Continuum" at the Wolfram Demonstrations Project Nine-point conic and Euler line generalization, A further Euler line generalization, and The quasi-Euler line of a quadrilateral and a hexagon at Dynamic Geometry Sketches Bogomolny, Alexander, "Altitudes and the Euler Line" and "Euler Line and 9-Point Circle", Cut-the-Knot Kimberling, Clark, "Triangle centers on the Euler line", Triangle Centers Stankova, Zvezdelina (February 1, 2016), "Triangles have a Magic Highway", Numberphile, YouTube Weisstein, Eric W. "Euler Line".