I'm only passingly familiar with either, but it seems like most of what ZeroMQ offers is already built into Erlang, yet there's an Erlang-ZeroMQ binding that's fairly active according to its github page. What am I missing?
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ZeroMQ bindings are available for a lot of programming languages, not just Erlang; this is one of the library's great strengths.
Erlang's built-in mechanisms are probably great as long as everything uses Erlang, but I doubt they are in any way compatible with other languages' native networking mechanisms.