Awesome Scala

A curated list of awesome Scala frameworks, libraries and software. Inspired by awesome-python.

Database

Database access libraries in Scala.

ScalikeJDBC - A tidy SQL-based DB access library for Scala developers.
Slick - Modern database query and access library for Scala.
Squeryl - A Scala DSL for talking with databases with minimum verbosity and maximum type safety.
Activate - Pluggable object persistence in Scala.
Scala ActiveRecord - ORM library for scala, inspired by ActiveRecord of Ruby on Rails.

Scala frameworks for web development.

Play - Makes it easy to build scalable, fast and real-time web applications with Java & Scala.
Skinny Framework - A full-stack web app framework upon Scalatra for rapid Development in Scala.
Scalatra - Tiny Scala high-performance, async web framework, inspired by Sinatra.
Lift - Secure and powerful full stack web framework.
Spray - A suite of scala libraries for building and consuming RESTful web services on top of Akka.
Finatra - A sinatra-inspired web framework for scala, running on top of Finagle.
Blue Eyes - A lightweight Web 3.0 framework for Scala, featuring a purely asynchronous architecture, extremely high-performance, massive scalability, high usability, and a functional, composable design.

Libraries for implementing authentications schemes.

scala-oauth2-provider - OAuth 2.0 server-side implementation written in Scala.
SecureSocial - A module that provides OAuth, OAuth2 and OpenID authentication for Play Framework applications.
play2-auth - Play2.x Authentication and Authorization module.

Libraries for code testing.

Libraries for scientific computing, data analysis and numerical processing.

Breeze - Breeze is a numerical processing library for Scala.
MLLib - Machine Learning framework for Spark
Spire - Powerful new number types and numeric abstractions for Scala.
Algebird - Abstract Algebra for Scala.
FACTORIE - A toolkit for deployable probabilistic modeling, implemented as a software library in Scala.
scala_prob - Scala embedded probabilistic programing library using delimited continuations (VERY Experimental).
probability-monad - Probability Distribution Monad in Scala.

Spark - Lightning fast cluster computing - up to 100x faster than Hadoop for iterative algorithms (memory caching) and up to 10x faster than Hadoop for single-pass MapReduce jobs. Compatible with YARN-enabled Hadoop clusters, can run on Mesos and in stand-alone mode as well.
Scalding - A Scala binding for the Cascading abstraction of Hadoop MapReduce.
Summingbird - An implementation of the "lambda architecture" as a software abstraction - a single API for Hadoop and Storm.

Modularization of applications, dependency injection, etc.

Domino - Write elegant OSGi bundle activators in Scala.
Scaldi - Lightweight Scala Dependency Injection Library.
MacWire - Scala Macro to generate wiring code for class instantiation. DI container replacement.
SubCut - Scala Uniquely Bound Classes Under Traits.

Scala extensions.

Scalaz - An extension to the core Scala library for functional programming.
Shapeless - A type class and dependent type based generic programming library for Scala.

Scala libraries and wrappers for Android development.

Your contributions are always welcome! Please submit a pull request or create an issue to add a new framework, library or software to the list.