propensive/magnolia

Simple, fast, debuggable generic derivation for typeclasses

typelevel/cats-mtl

cats transformer type classes.

djspiewak/shims

Seamless interop layer between cats and scalaz

typelevel/cats-effect

The IO monad for Scala

softwaremill/scala-common

Tiny independent libraries with a single purpose, often a single class

xuwei-k/play2scalaz

Scalaz typeclasses <~> Playframework2 typeclasses

hablapps/puretest

Purely functional testing in Scala

mlopes/wen

Date and time types and instances

scalaz/scalaz-deriving

Principled, fast, typeclass derivation.