Thanks for the answer kevin-rf.I know about the free data available for Landsat and other satellites over the internet, but this is not what I am looking for. what I am doing is actually part of a Ground Station design project, this ground station should receive the data directly from the satellite. as far as I know, there are some satellites from which one can receive and use the data for no cost, names of these satellites is what I am looking for.
Thanks once more kevin-rf.OK, I am looking for a list of satellites, it will look like