Property-based testing for Scala
Generic programming for Scala
command line options parsing for Scala
Powerful new number types and numeric abstractions for Scala.
Optics library for Scala
The IO monad for Scala
Simple refinement types for Scala
Writing Fast Parsers Fast in Scala
Native Scala mocking framework
Facebook's React on Scala.JS
simple combinator-based parsing for Scala. formerly part of the Scala standard library, now a separate community-maintained module
uPickle: a simple, fast, dependency-free JSON & Binary (MessagePack) serialization library for Scala
Flexible law checking for Scala
ScalaTags is a small XML/HTML construction library for Scala.
Experimental project to lay out basic algebra type classes
Simple caching in Scala
A macro-based PEG parser generator for Scala 2.10+
Generalized recursion schemes and traversals for Scala.
A cohesive & pragmatic framework of FP centric Scala libraries
Practical logging framework that doesn't require any other logging framework and can be completely configured programmatically.