I'm just relatively starting out in my astrophotography journey, so take this with a grain of salt. I have an 8SE on the alt-az mount. I use CPWI (free) from Celestron for mount/ focuser control and EOS Utility (also free) from Canon. Digital Professional (I think that's the name) is also free from Canon for editing. That being said, I have recently downloaded Astrophotography Tool (APT). Still trying to figure out how to use it, but so far it seems pretty nice. Backyard EOS is another alternative for camera control.