Scala HacktoberFest

Open-source Scala projects categorized as HacktoberFest

Top 23 Scala HacktoberFest Projects

  • Akka

    Build highly concurrent, distributed, and resilient message-driven applications on the JVM

    Project mention: Modern Async Primitives on iOS, Android, and the Web | | 2023-12-06

    Kotlin also has a construct for asynchronous collections/streams. Kotlin's version of AsyncSequence is called a Flow. Just as Swift's AsyncSequence builds upon prior experience with RxSwift and Combine, Kotlin's Flow APIs build upon earlier stream/collection APIs in the JVM ecosystem: Java's RxJava, Java8 Streams, Project Reactor, and Scala's Akka.

  • Play

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

    Project mention: Play Framework 2.9.0 Release Candidate | | 2023-09-20
  • WorkOS

    The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  • Lagom

    Reactive Microservices for the JVM

  • flix

    The Flix Programming Language

    Project mention: Learn Datalog Today | | 2024-01-21

    you can use Datalig within Flix

  • Metals

    Scala language server with rich IDE features 🚀

    Project mention: Reconnecting with Scala. What's new? | /r/scala | 2023-05-24

    Links: - - - - - - - - - - - - -

  • PureConfig

    A boilerplate-free library for loading configuration files

    Project mention: Spring and scala | /r/scala | 2023-03-13

    "PureConfig" is a library that uses Typesafe Config under the hood, but its point is really to be used in contexts other than the standard library or Akka, e.g. with the Typelevel ecosystem, thanks to the Cats module.

  • Akka HTTP

    The Streaming-first HTTP server/module of Akka

    Project mention: Akka-HTTP in android | /r/androiddev | 2023-04-12

    Here I've posted my issue

  • InfluxDB

    Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  • alpakka

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

  • Scala

    All Algorithms implemented in Scala (by TheAlgorithms)

  • scala-scraper

    A Scala library for scraping content from HTML pages

  • tofu

    Functional programming toolbox

    Project mention: Companies with interesting Scala projects | /r/scala | 2023-06-02

    Tinkoff has a strong Scala FP presense: - - -

  • Scapegoat

    Scala compiler plugin for static code analysis

  • jackson-module-scala

    Add-on module for Jackson ( to support Scala-specific datatypes

    Project mention: Scala Custom JSON codec Help | /r/scala | 2023-06-05

    The other comment is asking the right questions. But also how is it failing? Do you have an error message? Is JsonUtil part of Jackson? Do you need to be using with an object mapper?

  • Udash

    Scala framework for building beautiful and maintainable web applications.

  • AkkaGRPC

    Akka gRPC

  • potigol

    Linguagem Potigol - Linguagem de programação funcional moderna para iniciantes - A Functional Programming Language for Beginners

  • Stryker4s

    Mutation testing for Scala

  • fs2-aws

    fs2 utilities to interact with AWS

  • scala-webapp-template

    A pragmatic skeleton to build web applications in Scala/Scala.js, including user registration, login, admin portal, and, deployments

    Project mention: What is scala's modern Web API framework? | /r/scala | 2023-03-07

    I'm also working on improving our template to provide a better developer experience (

  • circe-yaml

    YAML parser for circe using SnakeYAML

  • LynxKite

    The complete graph data science platform

  • scala3.g8

  • feel-scala

    FEEL parser and interpreter written in Scala

    Project mention: Your views and opinions on Python's rule-engine package | /r/programming | 2023-04-13

    - Drools - Available in JVM environments (Java, Scala and similar) - uses FEEL for expression language

  • SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2024-01-21.

Scala HacktoberFest related posts


What are some of the best open-source HacktoberFest projects in Scala? This list will help you:

Project Stars
1 Akka 12,889
2 Play 12,482
3 Lagom 2,633
4 flix 2,007
5 Metals 2,000
6 PureConfig 1,443
7 Akka HTTP 1,334
8 alpakka 1,259
9 Scala 1,038
10 scala-scraper 711
11 tofu 513
12 Scapegoat 507
13 jackson-module-scala 494
14 Udash 444
15 AkkaGRPC 428
16 potigol 238
17 Stryker4s 191
18 fs2-aws 183
19 scala-webapp-template 164
20 circe-yaml 139
21 LynxKite 133
22 scala3.g8 123
23 feel-scala 110
SaaSHub - Software Alternatives and Reviews
SaaSHub helps you find the best software and product alternatives