In a workshop lead by Tim Lutz, students and teachers at the RPTU were trained over several weeks to create GeoGebra in STACK tasks for the primary school sector.
Follow the link for a temporary access to some of the students’ work: https://tools3.tim-lutz.de/ilias/ilias.php?baseClass=ilrepositorygui&cmdNode =xf:na&cmdClass=ilObjLTIConsumerGUI&cmd=launch&ref_id=89