http://car.rene-grothmann.de/doc_en/download.html
GeoGebra in Primary Mathematics Classrooms
Seminar Outline (Date: 2016/04/23)
1. Introduction to GeoGebra[br]2. Some Classroom Experience 與師同行[br]3. Mini Demonstration[br]4. Q & A[br]5. Thanks & Bye
More Dynamic Geometry Software
Desmos
https://www.geogebra.org/m/y6edyzgx