Scala 2 compiler and standard library. Scala 2 bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3

Scala.js, the Scala to JavaScript compiler

Scala Scripting

Compositional, streaming I/O library for Scala

Property-based testing for Scala

Asynchronous, Reactive Programming for Scala and Scala.js.

Library to read, analyze, transform and generate Scala programs

An experimental library for Functional Reactive Programming in Scala

First class syntax support for type classes in Scala

Scala combinator library for working with binary data

"Trust no one, bench everything." - sbt plugin for JMH (Java Microbenchmark Harness)

A macro-based PEG parser generator for Scala 2.10+

Scala library for managing immutable application model

Scalatron, a multi-player programming game in which coders pit bot programs (written in Scala) against each other

Accord: A sane validation library for Scala

BigPipe streaming for the Play Framework

Type-level & seamless command-line argument parsing for Scala

A foundational framework for distributed programming.

ScalaCL - run Scala on your GPU!

Tooling around scala-js

TypeScript Importer for Scala.js

Asynchronous programming in fully featured Scala syntax.

Boilerplate-free syntax for computations with effects

Type-level validation for Scala

Pure-functional random value generation

Fast JSON parser/generator for Scala

A debugger for Nashorn that uses Chrome DevTools as frontend

A Scala.js binding for Paper.js