Awesome Scala

ZIO — A type-safe, composable library for async and concurrent programming in Scala

Compositional, streaming I/O library for Scala

The pure asynchronous runtime for Scala

Asynchronous, Reactive Programming for Scala and Scala.js.

A fault tolerant, protocol-agnostic RPC system

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

Mirror of Apache Kafka

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

Quartz Extension and utilities for cron-style scheduling in Akka

A Scala library for scheduling arbitrary code to run at an arbitrary time.

FS2 streams based on cron expressions

An embedded job scheduler.

An open-source storage framework that enables building a Lakehouse architecture with compute engines including Spark, PrestoDB, Flink, Trino, and Hive and APIs

Apache Spark to Apache Cassandra connector

Alpakka Kafka connector - Alpakka is a Reactive Enterprise Integration library for Java and Scala, based on Reactive Streams and Akka.

Alpakka is a Reactive Enterprise Integration library for Java and Scala, based on Reactive Streams and Akka.

The missing MatPlotLib for Scala + Spark

Automatically generated diagrams and animations for Scala data structures

A Scala combinator-based plotting library.

Scala bindings for plotly.js

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

A Scala API for Cascading

Abstract Algebra for Scala

Streaming MapReduce with Scalding and Storm

Cassovary is a simple big graph processing library for the JVM

Graph for Scala is intended to provide basic graph functionality seamlessly fitting into the Scala Collection Library. Like the well known members of scala.collection, Graph for Scala is an in-memory graph library aiming at editing and traversing graphs, finding cycles etc. in a user-friendly way.

Data structures for pure functional programming in Scala

Fast, deboxed, specialized data structures for Scala

Simple caching in Scala

Thin Scala wrapper for Caffeine (https://github.com/ben-manes/caffeine)

A ZIO native cache with a simple and compositional interface

Functional Scala Cache

I know this because build.sbt knows this.

https://disneystreaming.github.io/smithy4s/

SBT plugin for generating code from Protocol Buffer using protoc

sbt plugin for generating scala.Tuple/Function related boilerplate code

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

The Scala 3 compiler, also known as Dotty.

Scala.js, the Scala to JavaScript compiler

Your favorite language gets closer to bare metal.

Zero-cost, compile-time, type-safe dependency injection library.

Scala Uniquely Bound Classes Under Traits

Scala extensions for Google Guice

Lightweight Scala Dependency Injection Library

Lightweight, modular, and extensible library for functional programming.

Principled Functional Programming in Scala

Modify deeply nested case class fields

Generalized recursion schemes and traversals for Scala.

Refinement types for Scala

Strong type constraints for Scala

Verification framework and tool for higher-order Scala programs

Programming is an exercise in linguistics; spice-up Scala types with Adjective.

Wonderful reusable code from Twitter

Optics library for Scala

Essential Building Blocks for Scala

Productivity-oriented collection of lightweight fancy stuff for Scala toolchain

Writing Fast Parsers Fast in Scala

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

friendly little parsers

Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful.

Typescript to Scala.js converter

Scala Native Binding Generator

Generic programming for Scala

Scala library for boilerplate-free, type-safe data transformations

A type-safe, reflection-free, powerful enumeration implementation for Scala with exhaustive pattern match warnings and helpful integrations.

First class syntax support for type classes in Scala

command line options parsing for Scala

A composable command-line parser for Scala.

Type-level & seamless command-line argument parsing for Scala

A small, convenient, dependency-free library for command-line argument parsing in Scala

configuration library for JVM languages using HOCON files

A boilerplate-free library for loading configuration files

Functional Configurations for Scala

Grafter is a library to configure and wire Scala applications

Convenient and performant logging library for Scala wrapping SLF4J.

The fastest logging library in the world. Built from scratch in Scala and programmatically configurable.

A pure Scala 3 logging library with no reflection

Logging Tools For Interaction with cats-effect

Distributed Tracing, Metrics and Context Propagation for applications running on the JVM

"Trust no one, bench everything." - sbt plugin for JMH (Java Microbenchmark Harness)

This is the development repository for sparkMeasure, a tool and library designed for efficient analysis and troubleshooting of Apache Spark jobs. It focuses on easing the collection and examination of Spark metrics, making it a practical choice for both developers and data engineers.

The scala API for Dropwizard's Metrics.

Modern Load Testing as Code

Property-based testing for Scala

Base classes to use when writing tests with Spark

A testing tool for Scala and Java developers

Graphs for Everyone

In-memory dimensional time series database.

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

Functional JDBC layer for Scala.

🔍 Elasticsearch Scala Client - Reactive, Non Blocking, Type Safe, HTTP Client

An open source indexing subsystem that brings index-based query acceleration to Apache Spark™ and big data workloads.

Elasticsearch plugin for nearest neighbor search. Store vectors and run similarity search using exact and approximate algorithms.

An async, non-blocking solr client for java/scala, providing a query interface like SolrJ

Akka Streams & Akka HTTP for Large-Scale Production Deployments

Using AWS SDK on the Scala REPL

Automated, multi-region container deployment

A Scala Kubernetes client library

Distributed State Management for Serverless

Feral cats are homeless, feral functions are serverless

Writing AWS Lambdas in Scala

Toolkit for building/deploying Lambda Functions with SBT

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

A git plugin for sbt

sbt plugin to roll the Git history

SBT plugin to support versioning

Create Docker images directly from sbt

Docker containers for testing in scala

Docker integration testing kit with Scala

Integrates Docker Compose functionality into sbt (archived as unmaintained)

sbt, the interactive build tool

Mill is a fast JVM build tool that supports Java, Scala, Kotlin and many other languages. 3-6x faster than Maven or Gradle for common workflows, Mill aims to make your project’s build process performant, maintainable, and flexible

Scala CLI is a command-line tool to interact with the Scala language. It lets you compile, run, test, and package your Scala code (and more!)

Protocol for IDEs and build tools to communicate about compile, run, test, debug and more.

Open-source code analysis platform for C/C++/Java/Binary/Javascript/Python/Kotlin based on code property graphs. Discord https://discord.gg/vv4MH284Hc

Library to read, analyze, transform and generate Scala programs

sbt plugin for scoverage

A tool for catching binary incompatibility in Scala

Scala language server with rich IDE features 🚀

A Scala kernel for Jupyter

A better notebook for Scala (and more)

SBT plugin for tweaking various IDE settings

Code formatter for Scala

sbt plugin adding support for source code formatting using Scalariform

sbt plugin for Scalafmt

Scalafmt SBT plugin

Pure Scala Artifact Fetching

sbt plugin to create a dependency graph for your project

:robot: A bot that helps you keep your projects up-to-date

sbt plugin that can check Maven and Ivy repositories for dependency updates

Flexible Scala code linting tool

Refactoring and linting tool for Scala

scalastyle

Scala compiler plugin for static code analysis

Removes large or troublesome blobs like git-filter-branch does, but faster. And written in Scala

a command line tool to apply templates defined on GitHub

An SBT plugin for dangerously fast development turnaround in Scala

sbt-header is an sbt plugin for creating file headers, e.g. copyright headers

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

sbt Native Packager

A release plugin for sbt

A sbt plugin for creating distributable Scala packages.

Scala library providing "source" metadata to your program, similar to Python's __name__, C++'s __LINE__ or Ruby's __FILE__.

Pretty-printing value, types and type-signatures in Scala

Macro based print debugging. Locates log statements in your IDE.

Scala macros for making debugging easier

Scala Scripting

The batteries-included Scala

Interactive Playground

The Scala interpreter is embedded in R and callbacks to R from the embedded interpreter are supported. Conversely, the R interpreter is embedded in Scala.

doc/tutorial generator for scala

Site and E-book Generator and Customizable Text Markup Transformer for sbt, Scala and Scala.js

Typechecked markdown documentation for Scala

Markdown documentation

Compositional music composition using Scala, SuperCollider, and Web Audio.

Minimal Scala library to process audio files

An sbt plugin for adding sounds to task completions

Scala library for audio DSP :: io/ugens/filters/analysis :: real-time + offline

Scalable Image Analysis and Shape Modelling

JVM - Java, Kotlin, Scala image processing library

Scala command-line wrapper around ffmpeg, ffprobe, ImageMagick, and other tools relating to media.

Start using OpenCV in your JVM project in just 1 line, no separate compiling, installing OpenCV, or fussing with your system required

ADAM is a genomics analysis platform with specialized file formats built using Apache Avro, Apache Spark, and Apache Parquet. Apache 2 licensed.

Tools for working with genomic and high throughput sequencing data.

An open-source toolkit for large-scale genomic analysis

Reach Biomedical Information Extraction

⛓️ Reference Waves Blockchain Node (client) implementation on Scala

Scorex 2.0 Core

Type-safe general-cryptography library - https://jmcardon.github.io/tsec/

Cryptographic primitives for Scala

Bitcoin Implementation in Scala

Scala DSL for money-related operations

High-performance Scala library for performing exchange rate lookups and currency conversions

A non-blocking Yahoo Finance Scala client

State of the Art Natural Language Processing

Chalk is a natural language processing library.

Natural Language Processors

A toolkit that wraps various natural language processing implementations behind a common interface.

Breeze is/was a numerical processing library for Scala.

Powerful new number types and numeric abstractions for Scala.

Optimus is a mathematical programming library for Scala.

Scala Math - Numerical (Matlab-like) and Symbolic (Mathematica-like) tool

PredictionIO, a machine learning server for developers and ML engineers.

Simple and Distributed Machine Learning

TransmogrifAI (pronounced trăns-mŏgˈrə-fī) is an AutoML library for building modular, reusable, strongly typed machine learning workflows on Apache Spark with minimal hand-tuning

Byzer (former MLSQL): A low-code open-source programming language for data pipeline, analytics and AI.

ScalaFX simplifies creation of JavaFX-based user interfaces in Scala

An FP game engine for Scala.

Compositional vector graphics in Scala / Scala.JS

A minimal Scala creative coding library targeting JVM/Javascript/Native

Scaloid makes your Android code easy to understand and maintain.

A modular functional UI language for Android

An easy-to-use sbt plugin for working with all Android projects

Live-coding and hot-deploy for Android

Simple, safe and intuitive Scala I/O

OS-Lib is a simple, flexible, high-performance Scala interface to common OS filesystem and subprocess APIs

File-watching library for Scala. Built on Java 7's WatchService, RxScala and Akka actors.

A simple ZIO library for interacting with external processes and command-line programs

Rocket Chip Generator

Scala based HDL

Flexible Intermediate Representation for RTL

Defines immutable, safe data structures for describing IP addresses, multicast joins, socket addresses and similar IP & network related data types

Remote shell access via SSH for your Scala applications

A minimalist wrapper for Netty in terms of scalaz-stream

IP Address utilities

Archivers and Compressors for Scala

Java and Scala abstractions for some compression algorithms.

CSV Reader/Writer for Scala

A CSV Handling Library for FP.

A handy SQL runner to work with CSV files

Functional, stream-based CSV processor for Scala

Yet another JSON library for Scala

JSON library

A lightweight, clean and simple JSON implementation in Scala

Scala macros for compile-time generation of safe and ultra-fast JSON codecs + circe booster

a publishing application for short texts

Markdown String Interpolator for Scala 3

Scala of Markdown: http://daringfireball.net/projects/markdown

Renders a live HTML view of a Markdown file. Bring your own editor.

Programmable, Typesafe Document Generation

Convert LaTeX markup to Unicode (in Scala and Java)

Scala port of https://github.com/nayuki/QR-Code-generator

Generate LaTeX/PDF output from within Scala

Given a scholarly PDF, extract figures, tables, captions, and section titles.

Science Parse parses scientific papers (in PDF form) and returns them in structured form.

Create PDFs from Scala using plain old HTML and CSS. Uses wkhtmltopdf on the back-end which renders HTML using Webkit.

A PDF module for Play Framework 2 (Scala)

Protocol buffer compiler for Scala.

Fast, customizable, boilerplate-free pickling support for Scala

Scala combinator library for working with binary data

Avro schema generation and serialization / deserialization for Scala

:dart: String metrics and phonetic algorithms for Scala (e.g. Dice/Sorensen, Hamming, Jaccard, Jaro, Jaro-Winkler, Levenshtein, Metaphone, N-Gram, NYSIIS, Overlap, Ratcliff/Obershelp, Refined NYSIIS, Refined Soundex, Soundex, Weighted Levenshtein).

Scala/Scala.js library for manipulating Fancy Ansi colored strings

Visually compare Scala data structures with out of the box support for arbitrary case classes.

Extremely fast string formatting

YAML parser for circe using SnakeYAML

Scala wrapper for SnakeYAML

Reads like yaml, writes like yaml; it must be yaml!

A new Scala wrapper for Joda Time based on scala-time

Implementation of the `java.time` API in scala. Especially useful for scala.js

Cross-platform CRON expression parsing for Scala

Cats Instances for Java Time

GeoTrellis is a geographic data processing engine for high performance applications.

Big Spatial Data Processing using Spark

RTree2D is a 2D immutable R-tree for ultra-fast nearest and intersection queries in plane and spherical coordinates

The Raster Foundry web application.

The Scala API for Quantities, Units of Measure and Dimensional Analysis

A dimensional analysis library based on dependent types

coulomb: unit analysis for Scala

Flexible, statically-checked experimental library for units of measurement

Library for building sbt plugins for the web

SBT plugin to use Scala.js along with any sbt-web server.

sbt-web plugin for Sass files

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

Silhouette is an authentication library for Play Framework applications that supports several authentication methods, including OAuth1, OAuth2, OpenID, CAS, 2FA, TOTP, Credentials, Basic Authentication or custom authentication schemes.

OAuth 2.0 server-side implementation written in Scala

Web & mobile client-side akka-http sessions, with optional JWT support

send electronic mail with scala

Play mailer plugin

asynchronous library for sending and receiving mail via fs2._

Emil is a library for dealing with E-Mail in Scala.

Accord: A sane validation library for Scala

validation api extracted from play

Scala library for boilerplate-free validation

Compile time validation of literal values built from strings

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

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

A minimal, idiomatic Scala interface for HTTP

Scala combinator library for building Finagle HTTP services

A simple gettext-like internationalization (aka i18n) library for Scala and Play Framework

Play-like internationalized messages for any Scala

GNU Gettext .po file loader for Scala

Internationalization (i18n) for Scala applications

Banana RDF

A Scala DSL for programming with the OWL API.

Scalate is a Scala based template engine which supports HAML, Mustache and JSP, Erb and Velocity style syntaxes.

Twirl is Play's default template engine

A Scala implementation of the Handlebars templating language (a superset of Mustache).

Typesafe HTML templates and static site generator in pure Scala

Telegram Bot API Wrapper for Scala

An asynchronous non-blocking Scala client for both the Twitter Rest and Streaming API

A GitHub API wrapper written in Scala

A scala library for interacting with the slack api and real time messaging interface

Efficient router for Laminar UI Library

Routing library for the Scala platform

Tiny dsl library for path et parameters of urls

front-end router library for single-page applications built with Scala.js, with an API inspired by Akka HTTP

Facebook's React on Scala.JS

Reactive data-binding for Scala

Simple, expressive, and safe UI library for Scala.js

Write Scala.js React apps just like you would in ES6

ScalaTags is a small XML/HTML construction library for Scala.

A Scala library for scraping content from HTML pages

scalaxb is an XML data binding tool for Scala.

Statically typed DOM API for Scala.js