The easy way to learn Scala.
Scala Exercises' lessons for the standard library
Exercises for the "Functional Programming Principles in Scala", part of the FP in Scala specialized program by EPFL.
Scala Exercises' lessons for the Cats library
Exercises based on the "Functional Programming in Scala" red book (http://manning.com/bjarnason)
Scala Exercises' lessons for the Shapeless library
Scala Exercises' lessons for the Doobie library
Scala Exercises for the Scala Optics library Monocle http://julien-truffaut.github.io/Monocle/
Exercises about Property-based testing for Scala
Exercises for the library Fetch
Exercises about Circe, yet another JSON library for Scala
Scala pureconfig exercises
Template to get you up to speed when creating new libraries
Exercises Compiler Plugin
Runtime library for Scala-Exercises Server