GeoGebra integrated in STACK

The first international STACK conference took place in 2018 at the University of Erlangen-Nuremberg in Fürth, Germany. There, one speaker presented a method developed for the conference to create graphically interactive randomized STACK tasks using GeoGebra, called GeoGebraSTACK_HelperTool (Lutz 2019). The new integration called "GeoGebra in STACK" makes this feature available directly within STACK core, so there is now a GeoGebra based way to create graphically demanding tasks, with the possibility of giving adaptive feedback within STACK. In addition, all applets from the GeoGebra material library are available for the new application. For more advanced task creators, "GeoGebra in STACK" provides documented commands to gain more control of the communication between GeoGebra and STACK. Link to GitHub repository and documentation: https://tim-lutz.de/STACK23.