Apache Spark - A unified analytics engine for large-scale data processing

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

A platform to build and run apps that are elastic, agile, and resilient. SDK, libraries, and hosted environments.

The Community Maintained High Velocity Web Framework For Java and Scala.

A Git platform powered by Scala with easy installation, high extensibility & GitHub API compatibility

A fault tolerant, protocol-agnostic RPC system

The Scala 3 compiler, also known as Dotty.

sbt, the interactive build tool

Principled Functional Programming in Scala

Scala.js, the Scala to JavaScript compiler

Breeze is/was a numerical processing library for Scala.

Generic programming for Scala

Deequ is a library built on top of Apache Spark for defining "unit tests for data", which measure data quality in large datasets.

Slick (Scala Language Integrated Connection Kit) is a modern database query and access library for Scala

Scala Scripting

Compile-time Language Integrated Queries for Scala

Property-based testing for Scala

Asynchronous, Reactive Programming for Scala and Scala.js.

A Scala kernel for Jupyter

JSON library

A library for time series analysis on Apache Spark

A module that provides OAuth, OAuth2 and OpenID authentication for Play Framework applications

A testing tool for Scala and Java developers

A lightweight, clean and simple JSON implementation in Scala

RxScala – Reactive Extensions for Scala – a library for composing asynchronous and event-based programs using observable sequences

🍃 Non-blocking, Reactive MongoDB Driver for Scala

Scala combinator library for working with binary data

ScalaFX simplifies creation of JavaFX-based user interfaces in Scala

simple combinator-based parsing for Scala. formerly part of the Scala standard library, now a separate community-maintained module