XabbaRus, the link that Skybird gave you is in my opinion the best of the best, I use it myself.
However, watch out, that program
should not be used over long periods, as it will overheat your microprocessor. The software calculates in real time the whole galaxy.
When you start that software, you will notice that it uses 100% of your CPU, so try not to stay to long on it, I know it's hard not to stay long, as the software offers the galaxy to explore.
