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Top 23 Scala Open-Source Projects
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Project mention: Introducing RisingWave's Hosted Iceberg Catalog-No External Setup Needed | dev.to | 2025-07-04
Because the hosted catalog is a standard JDBC catalog, tools like Spark, Trino, and Flink can still access your tables. For example:
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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Apache Kafka - High-throughput distributed streaming
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Project mention: Introducing RisingWave's Hosted Iceberg Catalog-No External Setup Needed | dev.to | 2025-07-04
Because the hosted catalog is a standard JDBC catalog, tools like Spark, Trino, and Flink can still access your tables. For example:
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Project mention: Show HN: A Implementation of Alpha Zero for Chess in MLX | news.ycombinator.com | 2025-05-29
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scala
Scala 2 compiler and standard library. Scala 2 bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3
I’ve been a web developer for years, but I haven’t touched Java in a long time — like, late-90s long. Back then, Java development felt cumbersome: lots of boilerplate and complex configurations. It was not exactly a pleasant experience for building simple web apps. So when I recently started exploring Scala and the Play Framework, I was curious more than anything. Has the Java developer experience gotten better? Is it actually something I’d want to use today?
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Deeplearning4j
Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running math code and a java based math library on top of the core c++ library. Also includes samediff: a pytorch/tensorflow like library for running deep learn...
Kotlin can use any Java library, giving you access to powerful machine learning frameworks like DeepLearning4J, Smile, and Weka.
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~/project$ sbt run [info] welcome to sbt 1.10.6 (Ubuntu Java 17.0.14) [info] loading settings for project scala-api-heroku-build from plugins.sbt... [info] loading project definition from /home/alvin/repositories/devspotlight/heroku/scala/scala-api-heroku/project [info] loading settings for project root from build.sbt... [info] loading settings for project docs from build.sbt... [info] __ __ [info] \ \ ____ / /____ _ __ __ [info] \ \ / __ \ / // __ `// / / / [info] / / / /_/ // // /_/ // /_/ / [info] /_/ / .___//_/ \__,_/ \__, / [info] /_/ /____/ [info] [info] Version 3.0.6 running Java 17.0.14 [info] [info] Play is run entirely by the community. Please consider contributing and/or donating: [info] https://www.playframework.com/sponsors [info] --- (Running the application, auto-reloading is enabled) --- INFO p.c.s.PekkoHttpServer - Listening for HTTP on /[0:0:0:0:0:0:0:0]:9000 (Server started, use Enter to stop and go back to the console...)
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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milewski-ctfp-pdf
Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and LaTeX source
IMO Bartosz Milewski gave a pretty good answer to the "why" question in the preface to his book:
> Second, there are many different kinds of math, and they appeal to different audiences. You might be allergic to calculus or algebra, but it doesn’t mean you won’t enjoy category theory. I would go as far as to argue that category theory is the kind of math that is particularly well suited for the minds of programmers. That’s because category theory — rather than dealing with particulars — deals with structure. It deals with the kind of structure that makes programs composable.
Composition is at the very root of category theory — it’s part of the definition of the category itself. And I will argue strongly that composition is the essence of programming. We’ve been composing things forever, long before some great engineer came up with the idea of a subroutine. Some time ago the principles of structured programming revolutionized programming because they made blocks of code composable. Then came object oriented programming, which is all about composing objects. Functional programming is not only about composing functions and algebraic data structures — it makes concurrency composable — something that’s virtually impossible with other programming paradigms.
https://bartoszmilewski.com/2014/10/28/category-theory-for-p...
And regarding:
> Anything that could be useful to you from CT can be explained in one afternoon over some coffee or beer.
Yes, you can go through the definitions, but you won't understand all of those concepts in one afternoon unless you're a savant.
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I think the best way to learn Lisp is to make a Lisp.
Two routes, I would recommend both.
https://github.com/kanaka/mal
https://t3x.org/
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awesomo
Cool open source projects. Choose your project and get involved in Open Source development now.
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Gitbucket
A Git platform powered by Scala with easy installation, high extensibility & GitHub API compatibility
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Project mention: DevOps What is DevSecOps? A guide to secure software development | dev.to | 2025-06-09
Source control and collaboration: Git, GitHub, GitLab
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Zeppelin
Web-based notebook that enables data-driven, interactive data analytics and collaborative documents with SQL, Scala and more.
Project mention: 📊 Visualise Presto Queries with Apache Zeppelin: A Hands-On Guide | dev.to | 2025-05-12In the previous article, we explored the installation of Presto. Building on that foundation, it's time to take your data exploration one step further by integrating Presto with Apache Zeppelin, a powerful web-based notebook that allows interactive data analytics.
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> 1) The language is too unstable
Thankfully not anymore. They got their act together and have been maintaining compatibility since Scala 3.0.0 has been released in May 2021, which is almost 4 years and counting.
https://github.com/scala/scala3/releases/tag/3.0.0
Scala 3.x is to remain compatible for the whole 3.x series (think of semantic versioning). There's no Scala 4 (breaking with Scala 3) in sight.
Also, Scala 3 and Scala 2.13 JARs are also compatible with each other, which helped with the transition.
> 2) The tooling around it is not the best
sbt may not be good. But Mill is much better than either Maven or Gradle. Especially Gradle. Bleep is also promising.
Scalafmt is widely used and liked. Scalafix -- the linter/fixer -- is used a bit less, but still of a good quality.
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> to see how they ended up in that situation
The "how" is almost always lack of discipline (or as I sometimes couch it, "imagination") but usually shit like https://github.com/microsoft/SynapseML/issues/405#:~:text=cl...
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I used Lua for years to configure my awesomewm desktop environment. Then, I started using it to configure my Wezterm. Since I bumped into an Emacs bug (lsp-mode bug to be fair), I switched quickly to Neovim after 20 years of Emacs, and I am using Lua to configure my Neovim. Last but not least, OpenResty gives my Nginx superpowers with Lua.
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Project mention: Automating Serialization/Deserialization Tests with Orkes Conductor and LLMs | dev.to | 2025-05-29
Run Spotless to auto-format the code for style consistency.
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Project mention: Zod: TypeScript-first schema validation with static type inference | news.ycombinator.com | 2024-10-07
You just gave me a flashback to scalaz https://github.com/scalaz/scalaz
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SaaSHub
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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 discussion
Scala related posts
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When plans change at 500 feet: Complex event processing of ADS-B aviation data with Apache Flink
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New Kafka Connect Vulnerability (CVE-2025-27817) Lets Attackers Read Any File
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DevOps What is DevSecOps? A guide to secure software development
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Chimney alternatives - ducktape and MapStruct
3 projects | 3 Jun 2025 -
Load testing vs performance testing
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Show HN: A Implementation of Alpha Zero for Chess in MLX
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📊 Visualise Presto Queries with Apache Zeppelin: A Hands-On Guide
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Jul 2025
Index
What are some of the best open-source Scala projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Apache Spark | 41,395 |
| 2 | Apache Kafka | 30,378 |
| 3 | Apache Flink | 25,001 |
| 4 | lila | 16,821 |
| 5 | scala | 14,388 |
| 6 | Deeplearning4j | 14,038 |
| 7 | Play | 12,583 |
| 8 | kafka-manager | 11,894 |
| 9 | milewski-ctfp-pdf | 11,274 |
| 10 | mal | 10,347 |
| 11 | awesomo | 9,591 |
| 12 | Gitbucket | 9,265 |
| 13 | awesome-scala | 9,112 |
| 14 | Finagle | 8,829 |
| 15 | Gatling | 6,711 |
| 16 | Zeppelin | 6,511 |
| 17 | papermill | 6,212 |
| 18 | dotty | 6,051 |
| 19 | SynapseML | 5,145 |
| 20 | lsp-mode | 4,945 |
| 21 | spotless | 4,949 |
| 22 | sbt | 4,850 |
| 23 | Scalaz | 4,671 |
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