The Scala Library Index

A USB-C hardware license dongle for professional software: authentication in a secure element, an SDK for 37 languages, and licensing that works offline.

Makes the Coursier application available via MCP

A Computer Algebra System for Scala 3: symbolic calculus, exact arithmetic, linear algebra, integral transforms, control theory, and a REPL.

Introduces macro annotations `@aux`, `@self`, `@instance`, `@apply`, `@delegated`, `@syntax`

Experimental Scala 3 Macro Paradise: pre-typer macro annotations that can generate class members, companions, and sibling definitions visible to ordinary typing. Extends Scala 3 macro-annotation experiments with precompiled external handlers, source-ordered composition, validation, and rollback.

Another Lexer Parser And Compiler Alpaca. A type-safe lexer and parser library for Scala 3, featuring compile-time validation and a pattern-matching DSL.

A fast, portable (JS/JVM/native), and robust implementation of LinkML for cross-language data modeling

A pure-Scala symbolic regex algebra with exact language containment (subset) checks, cross-built for JVM, Scala.js, and Scala Native

Semantic tooling for Scala coding agents, combining compiler/test truth, SemanticDB, presentation-compiler evidence, symbol reconciliation, FP analysis, and an agent-friendly CLI/MCP interface.

Experimental Scala 3 quasiquotes: Scala-2-style structural construction/matching for quoted terms, plus compiler-free term/type/definition models inspired by Scalameta. Incrementally exploring the missing low-level quasiquote layer for Scala 3.

mcodec - GenCodec-style serialization for Scala 3, built on M&DE

Mirror Annotations & Default Extraction. A Scala 3 macro library that extends scala.deriving.Mirror with annotation metadata, default values, generated members, and transparent wrapper support.

Shared Scala 3 utilities (JVM/JS/Native) used across halotukozak's libraries

Scala 2 compiler and standard library. Scala 2 bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3

A testing tool for Scala and Java developers

The Scala 3 compiler, also known as Dotty.

Scala.js, the Scala to JavaScript compiler

Lightweight, modular, and extensible library for functional programming.

Property-based testing for Scala

A platform to build and run apps that are elastic, agile, and resilient. SDK, libraries, and hosted environments.

Yet another JSON library for Scala

Software Specifications for Scala

The pure asynchronous runtime for Scala

Scala testing library with actionable errors and extensible APIs

configuration library for JVM languages using HOCON files

Apache Spark - A unified analytics engine for large-scale data processing

Your favorite language gets closer to bare metal.

The Community Maintained High Velocity Web Framework For Java and Scala.

Convenient and performant logging library for Scala wrapping SLF4J.