Scala Extensions

Open-source Scala projects categorized as Extensions

Top 23 Scala Extension Projects

  1. cats

    Lightweight, modular, and extensible library for functional programming.

  2. 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.

    InfluxDB logo
  3. Scalaz

    Principled Functional Programming in Scala

    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

  4. Shapeless

    Generic programming for Scala

    Project mention: C++26: more constexpr in the core language | news.ycombinator.com | 2025-04-23

    > 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

  5. Twitter Util

    Wonderful reusable code from Twitter

  6. Ammonite-Ops

    Scala Scripting

    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")

  7. refined

    Refinement types for Scala

  8. Monocle

    Optics library for Scala

    Project mention: Monocle: Optics Library for Scala | news.ycombinator.com | 2024-11-22
  9. 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.

    Stream logo
  10. better-files

    Simple, safe and intuitive Scala I/O

  11. Chimney

    Scala library for boilerplate-free, type-safe data transformations

    Project mention: Chimney alternatives - ducktape and MapStruct | libhunt.com/r/chimney | 2025-06-03
  12. Enumeratum

    A type-safe, reflection-free, powerful enumeration implementation for Scala with exhaustive pattern match warnings and helpful integrations.

  13. Scala Async

    An asynchronous programming facility for Scala

  14. scala.meta

    Library to read, analyze, transform and generate Scala programs

    Project mention: C++26: more constexpr in the core language | news.ycombinator.com | 2025-04-23

    > 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

  15. Cassovary

    Cassovary is a simple big graph processing library for the JVM

  16. Simulacrum

    First class syntax support for type classes in Scala

  17. Scala-Logging

    Convenient and performant logging library for Scala wrapping SLF4J.

  18. n-scala

    A new Scala wrapper for Joda Time based on scala-time

  19. Quicklens

    Modify deeply nested case class fields

  20. Freestyle

    A cohesive & pragmatic framework of FP centric Scala libraries

  21. Eff

    Eff monad for cats - https://atnos-org.github.io/eff

  22. 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.

  23. scribe

    The fastest logging library in the world. Built from scratch in Scala and programmatically configurable. (by outr)

  24. LArray

    Large off-heap arrays and mmap files for Scala and Java

  25. Hamsters

    A mini Scala utility library

  26. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

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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).

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Scala Extensions related posts

  • Make Invalid States Unrepresentable

    2 projects | dev.to | 2 Feb 2024
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    5 projects | dev.to | 27 Nov 2023
  • Chimney 0.8.0 (stable) released

    1 project | /r/scala | 13 Oct 2023
  • RFC: A Path Forward for Ammonite REPL and Scripts in 2023 and Beyond

    1 project | /r/scala | 3 Sep 2023
  • Chimney 0.8.0-M1 with the initial support for Scala 3

    1 project | /r/scala | 5 Aug 2023
  • Chimney 0.8.0-M1 – type mapping library for Scala released for Scala 3

    1 project | news.ycombinator.com | 3 Aug 2023
  • Question regarding Recursive datatypes and cats typeclasses (Haskell to Scala)

    3 projects | /r/scala | 6 Jul 2023
  • A note from our sponsor - SaaSHub
    www.saashub.com | 9 Jul 2025
    SaaSHub helps you find the best software and product alternatives Learn more →

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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