Acyclic is a Scala compiler plugin to let you prohibit circular dependencies between files
Pretty-printing value, types and type-signatures in Scala
Macros for simple/safe RPCs between Scala applications, including ScalaJS/ScalaJVM
An experimental library for Functional Reactive Programming in Scala
ScalaTags is a small XML/HTML construction library for Scala.
A simple testing framework for Scala
Writing Fast Parsers Fast in Scala
Scala/Scala.js library for manipulating Fancy Ansi colored strings
OS-Lib is a simple, flexible, high-performance Scala interface to common OS filesystem and subprocess APIs
A Scala port of the popular Python Requests HTTP client: flexible, intuitive, and straightforward to use.
Programmable, Typesafe Document Generation
Your shiny new Java/Scala build tool!
Castor is a lightweight, typed Actor library for Scala and Scala.js
Tooling around scala-js
uPickle: a simple, fast, dependency-free JSON & Binary (MessagePack) serialization library for Scala
Cask: a Scala HTTP micro-framework