Provides immutable datatypes for working with bits and bytes
Easy, fast, transparent generic derivation of typeclass instances
A fault tolerant, protocol-agnostic RPC system
Scala library providing "source" metadata to your program, similar to Python's __name__, C++'s __LINE__ or Ruby's __FILE__.
Mirror of Apache Kafka
ScalaTags is a small XML/HTML construction library for Scala.
Powerful new number types and numeric abstractions for Scala.
Configurable generic derivation for Circe
First class syntax support for type classes in Scala
OS-Lib is a simple, flexible, high-performance Scala interface to common OS filesystem and subprocess APIs
Parallel collections standard library module for Scala 2.13+
Generation of arbitrary case classes / ADTs instances with scalacheck and shapeless
Wonderful reusable code from Twitter
Scala combinator library for working with binary data
ScalaTest + Play
ScalaTest + JMock provides integration support between ScalaTest and Mockito.
Functional JDBC layer for Scala.
(No longer actively maintained.)
Flexible law checking for Scala
Jawn is for parsing jay-sawn (JSON)