Quick start

• Official Website

• Try Scala Online with Scastie or ScalaFiddle

• Contribute to Scala

• Scala Center (not-for-profit scala org)

• Documentation

• StackOverflow Recent Questions

Platforms

• JVM (main language site)

• Scala.js

• Scala Native

Community

• Official Scala Chat Server (Discord)

• Official Scala User Forum

• Official Scala Contributors Forum

Coding Tools:

IDES / Programming Environments

• IntelliJ with Scala Plugin

• Ammonite Scripting, REPL, System shell

• Metals (VSCode, Sublime, etc)

• ScalaIDE (Eclipse Plugin)

Build Tools

• SBT (Most used in community)

• Bloop

• Mill

• Maven

• Gradle (from Java ecosystem)

Code Formatting / Linting

• Scalafmt

• Scalafix (Linter/Refactorer)

• ZIO IntelliJ

• Wartremover

Free Books, Tutorials and Guides:

• Scala Exercises

• Twitter's Scala School

• Scala Tutorial

• Programming in Scala, First Edition

• Hands-on Scala.js

• Underscore.io books (many free books)

• 47Degrees Scala Exercises

• The Neophyte's Guide to Scala

Non-free Books:

• Programming in Scala, Third Edition

• Programming Scala (O'Reilley)

• Official book recommendations

Advanced!:

• Functional Programming in Scala (Manning)

• Mastering Advanced Scala

• Zionomicon

Free Scala Courses:

* Functional Programming Principles in Scala
* Functional Program Design in Scala
* Parallel Programming * Big Data Analysis with Scala and Spark
* Introduction to Programming with Dependent Types in Scala (advanced)

Non-Free Courses:

• Scala 3 and Functional Programming Essentials

Scala Conferences:

* Functional Scala (UK/Remote)
* LambdaConf (USA) * Typelevel Summits (Misc.) * Scala by the Bay (USA) * flatMap (Norway) * Scala Up North (Canada) * Scala Days (USA, Europe)
* Scala World (UK)
* Scala Swarm (Portugal)
* Scala.io (France)
* Scalar (Central Europe) * Scala Sphere (Poland)
* nescala (USA)
* LX SCALA (South-West Europe)
* ScalaConf (Russia)

Podcasts:

• Corecursive

• Scala Love

Scala Jobs:

• Functional Jobs

• Lightbend Customer Postings

• Functional Works

• Scala Jobs

Scala Libraries:

• Scaladex: The Scala Library Index

Web Development and Microservices
* ZIO HTTP

• Caliban
• Play
  * Akka HTTP
  * Lagom * Sttp (HTTP Client) * http4s * Finch * Udash - Frontend and Backend
  * Lift
  * Scalatra
  * Skinny
  * Vert.x
  * Sangria - GraphQL

Web Front End

• Scala.js

• ScalaJS-React

• Binding.scala

• React4s

• Slink

Database Access

• Anorm (RDBMS)
• ScalikeJDBC (RDBMS)
• Doobie (RDBMS)
• Quill (RDBMS + Cassandra)
• Phantom (Cassandra)
• ReactiveMongo (MongoDB)
• Elastic4s (ElasticSearch)
• Slick (RDBMS)

Functional Programming

• Typelevel
  large functional programming community
• ZIO - Solutions powered by Functional Programming
• Shapeless
• Cats

Concurrency / Parallelism

• Akka

• ZIO

• Monix

Mathematics

• Spire

Distributed Computing

• Apache Spark

• Apache Flink

• Apache Gearpump

• Apache Kafka

Blockchain

• Bitcoin-S

Miscellaneous:

• Scodec

Open Source Applications written in Scala

• Lichess (chess)

• Graphcool (GraphQL)

• Apache Kafka

• Gitbucket

• Crypto Coin Alerts

• Ore

• Hepek - Static Site Generator

Want your library here? Message the moderators!

Related Communities:

• /r/ScalaStudyGroup

• /r/ScalaConferenceVideos

• /r/Akka

• /r/ApacheSpark

• /r/ApacheKafka

Blogs/Periodicals:

• Official blog

• Rock the JVM

• Lihaoyi

• ZIO News

• SoftwareMill

• tpolecat

• Typelevel

• David Barri aka /u/japgolly

• Scala Times(weekly news)