Crossbeam went through lots of improvements over the last few years. We haven’t publicized them that much because things were constantly in flux and needed a long time to get past the “research” stage.
These days, however, the library is shaping up nicely and Crossbeam is getting more and more mature. Check out the documentation for an overview of what it offers at the moment.
I wrote a blog post that goes into more detail:
Happy to answer any questions!