Longstanding supporter of the question2answer forum software. See my q2apro plugins @github.Web Mathematics
I pioneered in creating unique math teaching videos and math programs to make mathematics attractive to students. Founder of the biggest German mathematics forum. Love doing educational animations on HTML5 Canvas.
Developed "Assistenzrechner" an assistance calculator with visualisations using Three.js and EaselJS. Try the English version of Geoservant 3D for instance.