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Top 23 Scala HacktoberFest Projects
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During my career break that I started in 2025, I started exploring the ever-changing Generative AI landscape. In Decemember, I was exploring Spring Boot as I hadn't used it in anger professionally having used other Java frameworks like Jersey, Play and I wanted to build something.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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kyuubi
Apache Kyuubi is a distributed and multi-tenant gateway to provide serverless SQL on data warehouses and lakehouses.
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Project mention: Neovim + Java LSP on a Play Framework sbt Project — The Missing Guide | dev.to | 2026-03-26
Metals understands sbt natively. Great. But its Java support is minimal — no completions, no hover, no organize imports. A Metals maintainer explicitly stated: "I can't imagine the case when somebody wants to use Metals on a full-java project." Fair enough.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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alpakka
Alpakka is a Reactive Enterprise Integration library for Java and Scala, based on Reactive Streams and Akka.
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jackson-module-scala
Add-on module for Jackson (https://github.com/FasterXML/jackson) to support Scala-specific datatypes
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potigol
Linguagem Potigol - Linguagem de programação funcional moderna para iniciantes - A Functional Programming Language for Beginners
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scala-webapp-template
A pragmatic skeleton to build web applications in Scala/Scala.js, including user registration, login, admin portal, and, deployments
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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).
Scala HacktoberFest discussion
Scala HacktoberFest related posts
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Allocating on the Stack
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Scala 3 slowed us down?
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Claude Code for VSCode
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The Flix Programming Language
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Deploying a Scala Play Application to Heroku
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The Flix Programming Language
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RustRover – A Standalone Rust IDE by JetBrains
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Oct 2026
Index
What are some of the best open-source HacktoberFest projects in Scala? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Play | 12,615 |
| 2 | Lagom | 2,629 |
| 3 | kyuubi | 2,368 |
| 4 | Metals | 2,332 |
| 5 | Elastic4s | 1,637 |
| 6 | PureConfig | 1,539 |
| 7 | Akka HTTP | 1,349 |
| 8 | alpakka | 1,268 |
| 9 | Scala | 1,104 |
| 10 | scala-scraper | 731 |
| 11 | Scapegoat | 557 |
| 12 | tofu | 540 |
| 13 | jackson-module-scala | 505 |
| 14 | Udash | 452 |
| 15 | potigol | 268 |
| 16 | Stryker4s | 217 |
| 17 | fs2-aws | 205 |
| 18 | scala-webapp-template | 186 |
| 19 | scala3.g8 | 160 |
| 20 | circe-yaml | 147 |
| 21 | feel-scala | 136 |
| 22 | sbt-jni | 136 |
| 23 | slinc | 112 |
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