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Top 23 Scala Scala3 Projects
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> It's kind of like the small string optimization you see in C++ ...
Agreed. These types of optimizations can yield significant benefits and are often employed in language standard libraries. For example, the Scala standard library employs an analogous optimization in their Set[0] collection type.
0 - https://github.com/scala/scala3/blob/88438e2c6e6204e12666067...
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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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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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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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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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Ultraviolet: WebGL Shaders in Scala 3
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A note from our sponsor - SaaSHub
www.saashub.com | 16 Jul 2026
Index
What are some of the best open-source Scala3 projects in Scala? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | dotty | 6,275 |
| 2 | Chimney | 1,254 |
| 3 | jsoniter-scala | 817 |
| 4 | trading | 662 |
| 5 | ducktape | 439 |
| 6 | scalaprops | 281 |
| 7 | scala3.g8 | 157 |
| 8 | iskra | 143 |
| 9 | functional-way | 129 |
| 10 | scala3-migrate | 113 |
| 11 | Inkuire | 93 |
| 12 | sharaf | 65 |
| 13 | scala-js-games | 65 |
| 14 | virgil | 40 |
| 15 | scala-ql | 38 |
| 16 | scala-3-crash-course | 33 |
| 17 | openapi4s | 27 |
| 18 | squery | 21 |
| 19 | dotty-patched | 20 |
| 20 | smithy4play | 18 |
| 21 | skunk-crypt | 6 |
| 22 | sight-dotty | 4 |
| 23 | cel-sandbox | 2 |
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