I have been using Geogebra for quite a few years. I have tried to produce interactive worksheets to give students additional problems in a variety of classes. I have given some talks on GeoGebra and its use: see a list of presentations on my resume at [url]https://sites.google.com/site/drhopkinsbackground/[/url] I began trying to organize my work by classes in Geogebratube, so my books are mostly organized by classes. In 2016, I was approached by Pearson to work on some Interactive Figures to accompany the 14th edition of Thomas Calculus (see Features given at [url]https://www.pearsonhighered.com/program/Hass-Thomas-Calculus-plus-My-Math-Lab-with-Pearson-e-Text-Access-Card-package-14th-Edition/PGM1248191.html [/url] to learn more about those Interactive Figures).