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Apache Beam seems to be an implementation of this idea. It works well when the things you have to do matches the logic, but it gets tricky if you need to do stuff iteratively or recursively.

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Beam has some overlap, but in my understanding it has a rather involved syntax for defining the data flows, quite far from the simple list of connections between in and out ports that you see in FBP systems following J P Morrisons principles more closely.

Apache NiFi comes quite a lot closer, with the main difference that they only have a single in-port, instead of separate named ones. Also it seems to be among the more heavy and complex implementations (for good and bad).

"They" meaning "FBP-like" or "FBP-inspired systems", to use Joe Witt's terminology... They are usually control-flow oriented, and to my mind do not yield the productivity and maintainability advantages of the "classical" FBP paradigm shift. I recently asked Node-RED's Nick O'Leary why Node-RED only allows one input port, and the answer was something like "because we have never run into the requirement"... a) this is not something that can easily be added after the fact, without totally rethinking the product architecture, and b) trying to build complex systems without that feature would be, to me, like trying to hang wallpaper with only one hand! One litmus test I use is that of concatenating data streams using the two different paradigms - I tried to describe this in an article a year or so ago, recently updated: https://jpaulm.github.io/fbp/concat.html Cheers!

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