The Scala Library Index

Collection of utilities and common patterns useful across Scala 3 projects

Cache-friendly sbt-dynver policy for CI (stable jar names between tags)

Scala Native async I/O, built on libuv, integrated with cats-effect.

Code-first tests-as-docs site generator for Scala — DocSpecs that assert in CI and SSR-render through ascent.

Effect-native reactive UI for Scala 3. Renders straight to the DOM — no virtual DOM, no diffing — with ZIO effects, typed errors, and resource-safe lifecycles first-class. Build your UI the way you build the rest of your ZIO app.

Play modules for Flyway

OpenTelemetry integrations built for the Scala ecosystem using zio-telemetry

Write Scala docs where 2.13 and 3.x live happily in the same Markdown file — every block compiled and run by its own real compiler.

A framework to allow MapReduce applications to use Akka actors

A type safe SQL client and interpolator for Scala 3 and ZIO

Cross-platform (JVM + Scala Native) WebAuthn assertion verifier for Scala 3

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