Scala 2 compiler and standard library. For bugs, see scala/bug
A testing tool for Scala and Java developers
Property-based testing for Scala
Build highly concurrent, distributed, and resilient message-driven applications on the JVM
Statically typed DOM API for Scala.js
Lightweight, modular, and extensible library for functional programming.
The Scala 3 compiler, also known as Dotty.
Software Specifications for Scala
Yet another JSON library for Scala
Scoverage Scala Code Coverage Core Libs
Generic programming for Scala
The pure asynchronous runtime for Scala
Convenient and performant logging library for Scala wrapping SLF4J.
Apache Spark - A unified analytics engine for large-scale data processing
The Streaming-first HTTP server/module of Akka
configuration library for JVM languages using HOCON files
The Play JSON library
makes some Scala 2.13 APIs (primarily collections, also some others) available on 2.11 and 2.12, to aid cross-building