In 2015, CNES launched a platform called PEPS that provides free access to data collected by the Sentinel satellites, in the hopes of encouraging French firms and research scientists to use it in their work.
To provide ready to use images, the CNES is offering some image processing. For instance, for radar images, some changes has to be made to position the image onto a standard world grid and adjust the image on the floor elevation.
Get some images here.