I am looking for a free (or low-cost) GIS-based software that allows users to draw spatial polygons using Google Earth as a background so they can draw a feature that is as precise as possible. A
download button would be useful as well.
The polygons might be agricultural fields, parks within urban perimeters, construction sites etc. There would be around 3000 users drawing polygons (not necessarily at the same time but this would be the order of magnitude of the task).
This software would run on a Linux server but ultimately could be Windows as well. The user would be able to choose the name of the file to be saved in the server but the folder would be automatically determined by their username (or similar method that helps the administrator to easily identify and organize their files).
Is there such a tool available in the GIS ecosystem?