zio/zio-http   3.11.3

A next-generation Scala framework for building scalable, correct, and efficient HTTP clients and servers

com-lihaoyi/scalatags   0.13.1

ScalaTags is a small XML/HTML construction library for Scala.

sirthias/parboiled2   2.5.1

A macro-based PEG parser generator for Scala 2.10+

purplekingdomgames/indigo   0.22.0

An FP game engine for Scala.

scallop/scallop   6.0.0

a simple Scala CLI parsing library

bkirwi/decline   2.6.2

A composable command-line parser for Scala.

scala/scala-parser-combinators   2.4.0

simple combinator-based parsing for Scala. formerly part of the Scala standard library, now a separate community-maintained module

jwt-scala/jwt-scala   11.0.4

JWT support for Scala. Bonus extensions for Play, Play JSON, Json4s, Circe, uPickle, Spray and Argonaut

com-lihaoyi/upickle   4.4.3

uPickle: a simple, fast, dependency-free JSON & Binary (MessagePack) serialization library for Scala

shadaj/slinky   0.7.5

Write Scala.js React apps just like you would in ES6

wvlet/airframe   2026.2.2

Essential Building Blocks for Scala

suzaku-io/diode   1.1.14

Scala library for managing immutable application model

7mind/izumi   1.5.9

Productivity-oriented collection of lightweight fancy stuff for Scala toolchain

etorreborre/specs2   5.9.1

Software Specifications for Scala

stanch/reftree   1.5.0

Automatically generated diagrams and animations for Scala data structures

typelevel/cats-collections   0.9.10

Data structures for pure functional programming in Scala

scalamock/scalamock   7.5.5

Native Scala mocking framework

com-lihaoyi/cask   0.11.3

Cask: a Scala HTTP micro-framework. Cask makes it easy to set up a website, backend server, or REST API using Scala

typelevel/kittens   3.5.0

Automatic type class derivation for Cats

estatico/scala-newtype   0.4.4

NewTypes for Scala with no runtime overhead