Can someone name me few good bots in steemit and what they do?

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Gentlebot! The gentlebot project is a voting bot which only votes for comments on posts, and doesn't discriminate between different users' names or reputations. It is the classiest voting bot on steem, as it never posts all the spam that most of the voting bots do. The downside is that you can't pay gentlebot to vote for you.