You can find GeoGebra Activities (and create your own) here: https://www.geogebra.org/
Use the Search bar to find Activities. Clicking on an Activity's thumbnail opens it.
On top right you'll see the Menu (icon with three dots). Open the menu and and Create a copy of the Activity on your profile page, or, select Details to go to the overview page of the activity, where you can download it.
You can go to the Details page of an Activity also using the related option in the Activity thumbnail's menu.
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