Principled Functional Programming in Scala
Property-based testing for Scala
Asynchronous, Reactive Programming for Scala and Scala.js.
Optics library for Scala
A simple testing framework for Scala
Facebook's React on Scala.JS
uPickle: a simple, fast, dependency-free JSON & Binary (MessagePack) serialization library for Scala
ScalaTags is a small XML/HTML construction library for Scala.
Macros for simple/safe RPCs between Scala applications, including ScalaJS/ScalaJVM
Random Data Generation and/or Property Testing in Scala & Scala.JS.
Prickle is a library for easily pickling (serializing) object graphs between Scala and Scala.js.
Pure-functional random value generation
A lightweight JSON model for Scala and Scala.js
A very simple unit testing library for Scala / ScalaJS
Generic Scala/ScalaJS semantic web library
Labeled records for Scala based on structural refinement types and macros.