I really like using steemvoter.com The more SP you have the more accounts you can set to autovote. Also you set the timing and weight for the votes.
Another is steemauto.com. I like their curation trails, copying the votes made by trusted steemians. I've learned to set the weight low, since multiple curation trails results in dozens and dozens of outgoing votes per day.
They also have an auto-rewards feature which is really nice - automatically collect post/comment rewards and curation rewards without having to click that button every day. Good if you want to set your account on auto-pilot.