I used to work for a robotics company that made heavy use of OSGi.

We also wrapped OSGi in a services framework we created (and by that, I mean my boss wrote it, and then I added some features and bugfixes later), which we open-sourced.

What's really cool is that the Flow stuff from the article resembles a publish/subscribe library that we wrote and also open-sourced (under the name JFlux, even), which in turn was built on some interfaces that bear a resemblance to the Java 8 functional interfaces, except written for Java 6.

I don't think that this is true: OpenHAB, Nexus 3, a lot of the enterprise application servers... One can probably compile a pretty long list of things "running in production" using OSGi.