
 Center for Technology and Teacher Education: Mathematics Activities (Site not responding. Last check: 20071029) 
  David E. Joyce from the Department of Mathematics and Computer Science at Clark University in Worcester, MA has developed a Geometry applet demonstrating the Euler line of a triangle. 
  Many were developed in the 20thcentury, such as: Schiffler Point, Exeter Point, Parry Point, Congruent Isoscelizers Point, Yff Center of Congruence, Isoperimetric Point and Equal Detour Point, AjimaMalfatti Points, Apollonius Point, Morley Centers, Hofstadter Points, Equal Parallelians Point, Bailey Point. 
  There are also some classical triangle centers constructions: Centroid, Incenter, Circumcenter, Orthocenter, Fermat Point, Ninepoint center, Symmedian point, Gergonne point, Nagel point, Mittenpunkt, Spieker center, Feuerbach point, Isodynamic points, and Napoleon points. 
 teacherlink.org /content/math/activities/skpcenterstri2/resources.html (250 words) 
