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Top 23 Scala Scala3 Projects
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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jsoniter-scala
Scala macros for compile-time generation of safe and ultra-fast JSON codecs + circe booster
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trading
💱 Trading application written in Scala 3 that showcases an Event-Driven Architecture (EDA) and Functional Programming (FP)
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ducktape
Automatic and customizable compile time transformations between similar case classes and sealed traits/enums, essentially a thing that glues your code. Scala 3 only. Or is it duct 🤔
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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virgil
A purely functional Cassandra client built on top of the Datastax Java Driver supporting a variety of effect systems like ZIO & Cats-Effect supporting both Scala 2 & 3 (by kaizen-solutions)
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dotty-patched
Eval library and patched Scala-3/Dotty compiler. Evaluating source code and trees at compile time hacking multi-staging programming
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skunk-crypt takes a smaller, sharper angle: encryption is just another Skunk codec. You keep writing ordinary Skunk queries; you just swap text for crypt.text. Plain values in your application, AES-256-GCM ciphertext in the database, and the key never leaves your process.
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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 Scala3 discussion
Scala Scala3 related posts
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Scala 3.9.0 LTS Released
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Chimney alternatives - ducktape and MapStruct
3 projects | 3 Jun 2025 -
`boundary/break`: do you use it ? what do you do with it ?
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Iron updates: turning opaque types into value objects
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About Scala-Native
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I've started writing a book on Scala 3 Macros
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scala 3 does not have :javap. Does anyone have any tips how to get around this.
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A note from our sponsor - AppSignal
www.appsignal.com | 6 Oct 2026
Index
What are some of the best open-source Scala3 projects in Scala? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | dotty | 6,310 |
| 2 | Chimney | 1,256 |
| 3 | jsoniter-scala | 819 |
| 4 | trading | 664 |
| 5 | ducktape | 440 |
| 6 | scalaprops | 282 |
| 7 | scala3.g8 | 160 |
| 8 | iskra | 143 |
| 9 | sbt-jni | 136 |
| 10 | functional-way | 129 |
| 11 | scala3-migrate | 113 |
| 12 | Inkuire | 92 |
| 13 | sharaf | 67 |
| 14 | scala-js-games | 66 |
| 15 | virgil | 41 |
| 16 | scala-ql | 39 |
| 17 | scala-3-crash-course | 33 |
| 18 | openapi4s | 29 |
| 19 | squery | 22 |
| 20 | dotty-patched | 20 |
| 21 | smithy4play | 19 |
| 22 | skunk-crypt | 7 |
| 23 | sight-dotty | 4 |
Sponsored
AppSignal knows why the f*#k it crashed.
Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
www.appsignal.com