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Top 23 Scala Extension Projects
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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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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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> Combined with the extremely powerful compile-time reflection capabilities of D it's the closest thing I've seen to Lisp metaprogramming outside of that family of languages ...
Scala gets pretty close to LISP-level of metaprogramming support between its intrinsic support for macros[0] (not to be confused with the C/C++ preprocessor of the same name) the Scalameta project[1], and libraries such as Shapeless[2].
Not comparing Scala to D, just identifying a language with similar functionality.
0 - https://docs.scala-lang.org/scala3/reference/metaprogramming...
1 - https://scalameta.org/
2 - https://github.com/milessabin/shapeless
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Project mention: A year of uv: pros, cons, and should you migrate | news.ycombinator.com | 2025-02-18
Try Scala with an Ammonite script like https://ammonite.io/#ScalaScripts . The JVM ecosystem does dependencies right, there's no need to "pin" in the first place because dependency resolution is deterministic to start with. (Upgrading to e.g. all newer patch versions of your current dependencies is easy, but you have to make an explicit action to do so, it will never happen "magically")
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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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Enumeratum
A type-safe, reflection-free, powerful enumeration implementation for Scala with exhaustive pattern match warnings and helpful integrations.
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> Combined with the extremely powerful compile-time reflection capabilities of D it's the closest thing I've seen to Lisp metaprogramming outside of that family of languages ...
Scala gets pretty close to LISP-level of metaprogramming support between its intrinsic support for macros[0] (not to be confused with the C/C++ preprocessor of the same name) the Scalameta project[1], and libraries such as Shapeless[2].
Not comparing Scala to D, just identifying a language with similar functionality.
0 - https://docs.scala-lang.org/scala3/reference/metaprogramming...
1 - https://scalameta.org/
2 - https://github.com/milessabin/shapeless
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Scala Graph
Graph for Scala is intended to provide basic graph functionality seamlessly fitting into the Scala Collection Library. Like the well known members of scala.collection, Graph for Scala is an in-memory graph library aiming at editing and traversing graphs, finding cycles etc. in a user-friendly way.
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scribe
The fastest logging library in the world. Built from scratch in Scala and programmatically configurable. (by outr)
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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 Extensions discussion
Scala Extensions related posts
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Make Invalid States Unrepresentable
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Engenharia de Dados com Scala: aprenda a fazer webscraping dos filmes mais assistidos da Netflix em cada país
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Chimney 0.8.0 (stable) released
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RFC: A Path Forward for Ammonite REPL and Scripts in 2023 and Beyond
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Chimney 0.8.0-M1 with the initial support for Scala 3
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Chimney 0.8.0-M1 – type mapping library for Scala released for Scala 3
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Question regarding Recursive datatypes and cats typeclasses (Haskell to Scala)
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A note from our sponsor - SaaSHub
www.saashub.com | 9 Jul 2025
Index
What are some of the best open-source Extension projects in Scala? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | cats | 5,329 |
| 2 | Scalaz | 4,671 |
| 3 | Shapeless | 3,398 |
| 4 | Twitter Util | 2,716 |
| 5 | Ammonite-Ops | 2,623 |
| 6 | refined | 1,722 |
| 7 | Monocle | 1,678 |
| 8 | better-files | 1,475 |
| 9 | Chimney | 1,222 |
| 10 | Enumeratum | 1,206 |
| 11 | Scala Async | 1,155 |
| 12 | scala.meta | 1,138 |
| 13 | Cassovary | 1,049 |
| 14 | Simulacrum | 934 |
| 15 | Scala-Logging | 918 |
| 16 | n-scala | 869 |
| 17 | Quicklens | 838 |
| 18 | Freestyle | 614 |
| 19 | Eff | 587 |
| 20 | Scala Graph | 574 |
| 21 | scribe | 530 |
| 22 | LArray | 403 |
| 23 | Hamsters | 288 |
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