Hi Alex,
I will cover a few libraries. Just to name a few: cats, circe, http4s and ScalaTest.
Akka is currently not going to be covered in the book. The topic is hugeeeeeeee. So huge, that people have written books on it!
One of my favorite books on topic is Akka in Action by Manning -
https://www.manning.com/books/akka-in-action
Cheers,
Daniela