com-lihaoyi/fansi

Scala/Scala.js library for manipulating Fancy Ansi colored strings

outr/youi

Next generation user interface and application development in Scala and Scala.js for web, mobile, and desktop.

julienrf/play-json-derived-codecs

travisbrown/iteratee

Iteratees for Cats

djspiewak/parseback

A Scala implementation of parsing with derivatives

japgolly/scala-graal

Make usage of Graal features easy and safe from Scala. Also features Scala-based React SSR.

danielasfregola/random-data-generator

Random generator of test data in Scala based on Scalacheck and Shapeless

monix/minitest

The super light testing library for Scala and Scala.js

typelevel/paiges

an implementation of Wadler's a prettier printer

djspiewak/shims

Seamless interop layer between cats and scalaz

scala/scala-collection-compat

makes some Scala 2.13 APIs (primarily collections, also some others) available on 2.11 and 2.12, to aid cross-building

japgolly/nyaya

Random Data Generation and/or Property Testing in Scala & Scala.JS.

pepegar/hammock

Purely functional HTTP client

sirthias/borer

Efficient CBOR and JSON (de)serialization in Scala

frees-io/iota

Fast [co]product types with a clean syntax. For Cats & Scalaz.

sentenza/purecsv

A type-safe and boilerplate-free CSV library for Scala

log4s/log4s

High-performance SLF4J wrapper for Scala.

com-lihaoyi/pprint

Pretty-printing value, types and type-signatures in Scala

pheymann/typedapi

Build your web API on the type level.

alexarchambault/plotly-scala

Scala bindings for plotly.js