Simple, fast, debuggable generic derivation for typeclasses
cats transformer type classes.
Seamless interop layer between cats and scalaz
The IO monad for Scala
Tiny independent libraries with a single purpose, often a single class
Scalaz typeclasses <~> Playframework2 typeclasses
Purely functional testing in Scala
Date and time types and instances
Principled, fast, typeclass derivation.