We continue to develop resources related to the COVID-19 pandemic. See COVID-19 initiatives on Appropedia for more information.
Google SketchUp is available in free and "pro" versions. It is 3D software that allows you to share models using the Google 3D Warehouse and place them in Google Earth. It can be a useful tool for creating illustrations and models of Appropedia projects.
For some examples, see this article at Appropedia.