slick/slick

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

scalatra/scalatra

Tiny Scala high-performance, async web framework, inspired by Sinatra

com-lihaoyi/ammonite

Scala Scripting

twitter/util

Wonderful reusable code from Twitter

circe/circe

Yet another JSON library for Scala

twitter-archive/diffy

Find potential bugs in your services with Diffy

twitter/algebird

Abstract Algebra for Scala

softwaremill/elasticmq

In-memory message queue with an Amazon SQS-compatible interface. Runs stand-alone or embedded.

tpolecat/doobie

Functional JDBC layer for Scala.

pocorall/scaloid

Scaloid makes your Android code easy to understand and maintain.

twitter/summingbird

Streaming MapReduce with Scalding and Storm

apache/flink

Apache Flink

twitter/finatra

Fast, testable, Scala services built on TwitterServer and Finagle

scalameta/metals

Scala language server with rich IDE features 🚀

typelevel/scalacheck

Property-based testing for Scala

sbt/sbt-assembly

Deploy über-JARs. Restart processes. (port of codahale/assembly-sbt)

spotify/scio

A Scala API for Apache Beam and Google Cloud Dataflow.

typelevel/cats-effect

The pure asynchronous runtime for Scala

monix/monix

Asynchronous, Reactive Programming for Scala and Scala.js.

typelevel/spire

Powerful new number types and numeric abstractions for Scala.