ZeroMQ is fantastic. I've been using at work for a few years now, but I generally enjoy the tech anyway, their documentation[0] and "The Guide"[1] is also really nice, with examples for all of the different language bindings.

From C or Golang (or a bunch of other language bindings) you can set up some nice pub/sub or req/res with fan in/fan out and all sorts of cool routing with low-level, high speed sockets with the added power that ZMQ provides, such as the queueing, high-watermarks etc. You can also enable encryption easily with CurveZMQ which is a refreshing change from TLS.

[0]https://zeromq.org/get-started/

[1]https://zguide.zeromq.org/

I almost feel like the guide should be mandatory reading for anyone learning network programming. It gives extremely digestible summaries of most of the network patterns, when and why you'd use them, and then how they're done in ZeroMQ. Even if you end the guide thinking that ZeroMQ is stupid (which you probably wouldn't), you'd still probably benefit from having read the guide.

I love ZeroMQ, but I didn't think that had any first-class support for communicating in the browser (could be wrong).

I agree it's super nice though, even with a single process.