OttoKit
While this one isn’t my automator of choice, I like it and use it, it has great linking with the Sure Suite of products which I use a lot and it also has the most intergrations I know of for an automaton, with additional new items like ‘human in the loop’ it continues to be a leader in its class, I prefer the data ownership I get with FlowMattic but if you don’t want the hastle of hosting your automation this is a really good choice.
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