Scala Language

Open-source Scala projects categorized as Language
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Top 6 Scala Language Projects

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  1. Scala.js

    Scala.js, the Scala to JavaScript compiler

    Project mention: ClojureScript Gets Async/Await | news.ycombinator.com | 2026-05-08

  2. SaaSHub

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

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  3. Vale

    Compiler for the Vale programming language - http://vale.dev/ (by ValeLang)

    Project mention: Vale: A fast, safe, and easy programming language | news.ycombinator.com | 2026-04-19

  4. effekt

    A language with lexical effect handlers and lightweight effect polymorphism

    Project mention: Zig – New SPIR-V Back End Progress | news.ycombinator.com | 2026-06-29

    What Zig is doing is called "capability passing". I don't know if the Zig team is aware of this field of work, or have independently arrived upon it, but that's what is achieved by passing IO, memory allocators, and other stuff around.

    The core idea is that you create a capability for anything you want to track, such as using IO, allocating memory, or in your example making cross core or cross server calls. Now to perform these actions code has to have access to the capability. It's a very simple, but powerful, model.

    The Effekt language formalizes this, and adds safety properties: https://effekt-lang.org/ Scala 3 also has this.

    The papers are pretty readable, if you ignore the middle bits which go into the formal models.

  5. potigol

    Linguagem Potigol - Linguagem de programação funcional moderna para iniciantes - A Functional Programming Language for Beginners

  6. pragma

    Build GraphQL APIs In No Time

  7. fuse

    Fuse is a statically typed, purely functional language with higher-kinded types and ad-hoc polymorphism. It compiles to the GRIN whole-program optimizer, producing LLVM-generated native code. (by fuselang)

    Project mention: Show HN: Fuse – statically typed functional programming language | news.ycombinator.com | 2026-08-02

    Yeah the LSP support is next, my goal is to implement the language server in the fuse itself. At the moment there’s a simple formatter implementation fusefmt: https://github.com/fuselang/fuse/blob/master/examples/fusefm..., you can compile it with fuse and hook-it with your editor.

    For example I’ve this config in helix:

      [[language]]

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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Index

What are some of the best open-source Language projects in Scala? This list will help you:

# Project Stars
1 Scala.js 4,710
2 Vale 2,005
3 effekt 457
4 potigol 268
5 pragma 127
6 fuse 65

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