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ZeroMQ is sometimes called "sockets on steroids" for greatly simplifying data transfer between computers. It is an open-source standard with many language bindings, eliminating the "black box" of LabVIEW's other solutions. Have a look at The Guide for an introduction as to why ZMQ is revolutionary, the design patterns it provides, and why it's worth using in your applications.
News alert: LVZMQ underwent a major rewrite in v3, check the FAQ for more information!

This project is an ongoing effort to create robust bindings to the ZeroMQ library in LabVIEW. Effort is being dedicated to producing a stable, maintainable package which is true to the original implementation but remains easy to use. So please file a bug report or make a discussion post if you're having difficulties.

This project is under active development, so please check the FAQ for information. Install with the easy VIPM package, or checkout the most up-to-date code from the repository.

This library simply wraps the C functions in ZeroMQ, so you can easily transform the many C examples available. To demonstrate, some basic design patterns are showcased below.
Request/Reply
The "hello world" example below uses REQ/REP to demonstrate how to create a blocking server which waits for a connection and replies with a simple message

The client which connects to it is very simple, as demonstrated below:

Publish/Subscribe
Here's a simple PUB server which is transmitting to a python subscriber:
Note that in this example the PUB socket sends 5 messages but the SUB socket receives 4. This is called the "slow joiner" symptom and is underlying behaviour in ZeroMQ, to quote the guide "the subscriber will always miss the first messages that the publisher sends" (see the text in bold of the relevant chapter).