software recommendations - Seeking website to do geoprocessing online?

Is there a website in which I can do geoprocessing online?

I know there are a lot of sites that allow the visualisation of your data online or some basic map-making, but I need something more... Kind of like a free online GIS.

For example, go on a website, draw a polygon and extract the land cover inside.

Answer

It worked with Google Earth Engine.