Ok in addition to the ones I already mentioned I also trust resteem.bot (this one is slow though), abasinkanga, postresteem, yougotresteemed, and refresh.
I only tried these two once but they did work as advertised: kobusu, steemvote.
There are some "free" ones too but those are hit or miss. A lot will ask for upvotes and resteems which I don't care for. There is one guy, jordan1219444, who offers free resteems to his followers every couple of days and he doesn't ask for anything in return. There is also resteemable that will give you a free resteem if you follow the instructions on their page.
That's what I have learned so far. I can't say that it has paid off for me but I can, at least make almost a dollar on many of my posts instead of the 0.002 that I was earning before.