SteemAuto is not the first one: There is SteemVoter and Streemian. But SteemAuto is the youngest and the best. Forget those other twos again, it was just for your information. ;)

If you know who you want to support this will make it much easier AND you earn higher rewards pretty much guaranteed. Like I said, there is tons of micro-managing possible to tweak it for even higher returns. But this is the basic for everyone to make sure that your account is ALWAYS in use and grows your Steem Power (because you get curation rewards in SP).