Repositories list

• sbt-typelevel

  Public
  Let sbt work for you.

  scalasbttypelevel+ 1

  scalasbttypelevelsbt-plugin

  Scala

  •

  Apache License 2.0

  •6161 forks•185185 stars•6767 issues•3232 pull requests•Updated Aug 30, 2026Aug 30, 2026

• otel4s

  Public
  An OpenTelemetry library for Scala based on Cats-Effect

  catsscalametrics+ 4

  catsscalametricstypeleveltracingcats-effectopentelemetry

  Scala

  •

  Apache License 2.0

  •5050 forks•215215 stars•77 issues•22 pull requests•Updated Aug 30, 2026Aug 30, 2026

• simulacrum-scalafix

  Public
  Simulacrum as Scalafix rules

  Scala

  •1010 forks•3636 stars•66 issues•77 pull requests•Updated Aug 30, 2026Aug 30, 2026

• grackle

  Public
  Grackle: Functional GraphQL for the Typelevel stack

  Scala

  •

  Apache License 2.0

  •3232 forks•189189 stars•2121 issues•55 pull requests•Updated Aug 30, 2026Aug 30, 2026

• natchez

  Public
  functional tracing for cats

  catsscalatracing+ 4

  catsscalatracingopentracinghoneycombjaegercats-effect

  Scala

  •

  MIT License

  •7777 forks•340340 stars•1616 issues•1616 pull requests•Updated Aug 29, 2026Aug 29, 2026

• munit-cats-effect

  Public
  Integration library for MUnit & cats-effect

  Scala

  •

  Apache License 2.0

  •3939 forks•159159 stars•44 issues•55 pull requests•Updated Aug 29, 2026Aug 29, 2026

• jawn

  Public
  Jawn is for parsing jay-sawn (JSON)

  jsonscala

  jsonscala

  Scala

  •7272 forks•436436 stars•1212 issues•55 pull requests•Updated Aug 28, 2026Aug 28, 2026

• case-insensitive

  Public
  A case-insensitive string for Scala

  catsscalastring+ 1

  catsscalastringcase-insensitive

  Scala

  •

  Apache License 2.0

  •1515 forks•3838 stars•55 issues•55 pull requests•Updated Aug 28, 2026Aug 28, 2026

• scalacheck-xml

  Public
  Scalacheck instances for scala-xml

  Scala

  •11 fork•55 stars•00 issues•55 pull requests•Updated Aug 28, 2026Aug 28, 2026

• kind-projector

  Public
  Compiler plugin for making type lambdas (type projections) easier to write

  Scala

  •

  MIT License

  •7676 forks•924924 stars•1010 issues•00 pull requests•Updated Aug 28, 2026Aug 28, 2026

• cats-time

  Public
  Cats Instances for Java Time

  Scala

  •

  MIT License

  •2020 forks•9494 stars•11 issue•33 pull requests•Updated Aug 28, 2026Aug 28, 2026

• cats

  Public
  Lightweight, modular, and extensible library for functional programming.

  Scala

  •

  Other

  •1.2k1.2k forks•5.5k5.5k stars•224224 issues•5757 pull requests•Updated Aug 28, 2026Aug 28, 2026

• cats-effect

  Public
  The pure asynchronous runtime for Scala

  scalaasynchronouseffects+ 2

  scalaasynchronouseffectsfptypeclasses

  Scala

  •

  Apache License 2.0

  •577577 forks•2.2k2.2k stars•197197 issues•3131 pull requests•Updated Aug 28, 2026Aug 28, 2026

• scalac-options

  Public
  A library for configuring scalac options

  Scala

  •

  Apache License 2.0

  •1717 forks•4848 stars•66 issues•77 pull requests•Updated Aug 28, 2026Aug 28, 2026

• fs2

  Public
  Compositional, streaming I/O library for Scala

  scalastreamfunctional-programming+ 2

  scalastreamfunctional-programmingfpstreaming-computation

  Scala

  •

  Other

  •635635 forks•2.5k2.5k stars•106106 issues•4545 pull requests•Updated Aug 28, 2026Aug 28, 2026

• frameless

  Public
  Expressive types for Spark.

  scalasparkfunctional-programming+ 2

  scalasparkfunctional-programmingtypelevelfp

  Scala

  •

  Apache License 2.0

  •135135 forks•897897 stars•3737 issues•1010 pull requests•Updated Aug 28, 2026Aug 28, 2026

• kittens

  Public
  Automatic type class derivation for Cats

  Scala

  •

  Apache License 2.0

  •6666 forks•545545 stars•77 issues•22 pull requests•Updated Aug 28, 2026Aug 28, 2026

• scalacheck-effect

  Public
  Effectful property testing built on ScalaCheck

  Scala

  •

  Apache License 2.0

  •2626 forks•8383 stars•66 issues•44 pull requests•Updated Aug 28, 2026Aug 28, 2026

• cats-tagless

  Public
  Library of utilities for tagless final encoded algebras

  scalafunctional-programmingtagless

  scalafunctional-programmingtagless

  Scala

  •

  Apache License 2.0

  •4141 forks•320320 stars•99 issues•33 pull requests•Updated Aug 28, 2026Aug 28, 2026

• weaver-test

  Public
  A test framework that runs everything in parallel.

  Scala

  •

  Other

  •1515 forks•8585 stars•2424 issues•1313 pull requests•Updated Aug 28, 2026Aug 28, 2026

• vault

  Public
  Type-safe, persistent storage for values of arbitrary types

  Scala

  •

  MIT License

  •2020 forks•8484 stars•11 issue•11 pull request•Updated Aug 28, 2026Aug 28, 2026

• typelevel.g8

  Public
  A typelevel.g8 based on sbt-typelevel

  scalasbtgiter8

  scalasbtgiter8

  Scala

  •77 forks•1414 stars•88 issues•33 pull requests•Updated Aug 28, 2026Aug 28, 2026

• squants

  Public
  The Scala API for Quantities, Units of Measure and Dimensional Analysis

  Scala

  •

  Apache License 2.0

  •122122 forks•931931 stars•4444 issues•2222 pull requests•Updated Aug 28, 2026Aug 28, 2026

• shapeless-3

  Public
  Generic programming for Scala

  Scala

  •2424 forks•203203 stars•55 issues•22 pull requests•Updated Aug 28, 2026Aug 28, 2026

• scalacheck

  Public
  Property-based testing for Scala

  scalascalacheckproperty-testing

  scalascalacheckproperty-testing

  Scala

  •

  BSD 3-Clause "New" or "Revised" License

  •393393 forks•2k2k stars•5555 issues•1010 pull requests•Updated Aug 28, 2026Aug 28, 2026

• scalac-compat

  Public
  Lightweight tools for tackling Scalac version incompatibilities

  Scala

  •

  Apache License 2.0

  •44 forks•99 stars•00 issues•00 pull requests•Updated Aug 28, 2026Aug 28, 2026

• otel4s-sdk

  Public
  Implementation of the otel4s SDK modules in Scala from scratch

  typeleveltracingobservability+ 3

  typeleveltracingobservabilitycats-effectopentelemetryotel4s

  Scala

  •

  Apache License 2.0

  •33 forks•66 stars•66 issues•22 pull requests•Updated Aug 28, 2026Aug 28, 2026

• natchez-http4s

  Public
  Glorious integration layer for Natchez and Http4s.

  Scala

  •

  MIT License

  •1818 forks•5050 stars•44 issues•1212 pull requests•Updated Aug 28, 2026Aug 28, 2026

• mouse

  Public
  A small companion to cats

  catsscalatypelevel

  catsscalatypelevel

  Scala

  •

  MIT License

  •6666 forks•376376 stars•44 issues•66 pull requests•Updated Aug 28, 2026Aug 28, 2026

• log4cats

  Public
  Logging Tools For Interaction with cats-effect

  Scala

  •

  Apache License 2.0

  •7878 forks•416416 stars•1313 issues•1515 pull requests•Updated Aug 28, 2026Aug 28, 2026