New Satellite Data Sources
There's free LANDSAT Data on AWS https://aws.amazon.com/de/blogs/aws/start-using-landsat-on-aws/ (see also https://github.com/sat-utils/sat-api and https://github.com/plant99/felicette/wiki/Sample-images-generated-by-felicette) and there's an API for sentinel https://scihub.copernicus.eu/