Repositories list

• typelevel.github.com

  Public
  typelevel.org website

  Scala

  •112112 forks•4141 stars•2424 issues•77 pull requests•Updated Apr 18, 2026Apr 18, 2026

• Laika

  Public
  Site and E-book Generator and Customizable Text Markup Transformer for sbt, Scala and Scala.js

  Scala

  •

  Apache License 2.0

  •5454 forks•451451 stars•1111 issues•1919 pull requests•Updated Apr 18, 2026Apr 18, 2026

• otel4s-sdk

  Public

  typelevel/otel4s-sdk’s past year of commit activity
  Implementation of the otel4s SDK modules in Scala from scratch

  typeleveltracingobservability+ 3

  typeleveltracingobservabilitycats-effectopentelemetryotel4s

  Scala

  •

  Apache License 2.0

  •22 forks•55 stars•66 issues•00 pull requests•Updated Apr 18, 2026Apr 18, 2026

• otel4s

  Public

  typelevel/otel4s’s past year of commit activity
  An OpenTelemetry library for Scala based on Cats-Effect

  catsscalametrics+ 4

  catsscalametricstypeleveltracingcats-effectopentelemetry

  Scala

  •

  Apache License 2.0

  •4848 forks•208208 stars•55 issues•22 pull requests•Updated Apr 18, 2026Apr 18, 2026

• munit-cats-effect

  Public

  typelevel/munit-cats-effect’s past year of commit activity
  Integration library for MUnit & cats-effect

  Scala

  •

  Apache License 2.0

  •3838 forks•157157 stars•44 issues•33 pull requests•Updated Apr 18, 2026Apr 18, 2026

• keypool

  Public

  typelevel/keypool’s past year of commit activity
  A Keyed Pool Implementation for Scala

  Scala

  •

  MIT License

  •1616 forks•3939 stars•88 issues•66 pull requests•Updated Apr 18, 2026Apr 18, 2026

• cats-time

  Public

  typelevel/cats-time’s past year of commit activity
  Cats Instances for Java Time

  Scala

  •

  MIT License

  •2020 forks•9494 stars•11 issue•11 pull request•Updated Apr 18, 2026Apr 18, 2026

• cats-effect-testing

  Public

  typelevel/cats-effect-testing’s past year of commit activity
  Integration between cats-effect and test frameworks

  catsscalaspecs2+ 4

  catsscalaspecs2minitestscalatestutestcats-effect

  Scala

  •

  Apache License 2.0

  •4343 forks•195195 stars•88 issues•77 pull requests•Updated Apr 18, 2026Apr 18, 2026

• discipline-specs2

  Public
  Specs2 Integration for Discipline

  Scala

  •

  MIT License

  •1111 forks•99 stars•00 issues•00 pull requests•Updated Apr 18, 2026Apr 18, 2026

• discipline

  Public
  Flexible law checking for Scala

  scalatypelevelproperty-based-testing

  scalatypelevelproperty-based-testing

  Scala

  •

  MIT License

  •5959 forks•336336 stars•55 issues•00 pull requests•Updated Apr 18, 2026Apr 18, 2026

• feral

  Public

  typelevel/feral’s past year of commit activity
  Feral cats are homeless, feral functions are serverless

  Scala

  •

  Apache License 2.0

  •5252 forks•198198 stars•3131 issues•3838 pull requests•Updated Apr 17, 2026Apr 17, 2026

• fs2

  Public
  Compositional, streaming I/O library for Scala

  scalastreamfunctional-programming+ 2

  scalastreamfunctional-programmingfpstreaming-computation

  Scala

  •

  Other

  •631631 forks•2.4k2.4k stars•104104 issues•3939 pull requests•Updated Apr 17, 2026Apr 17, 2026

• natchez-http4s

  Public

  typelevel/natchez-http4s’s past year of commit activity
  Glorious integration layer for Natchez and Http4s.

  Scala

  •

  MIT License

  •1919 forks•5050 stars•44 issues•66 pull requests•Updated Apr 17, 2026Apr 17, 2026

• fabric

  Public

  typelevel/fabric’s past year of commit activity
  Object-Notation Abstraction for JSON, binary, HOCON, etc.

  Scala

  •

  MIT License

  •55 forks•132132 stars•00 issues•22 pull requests•Updated Apr 17, 2026Apr 17, 2026

• natchez

  Public
  functional tracing for cats

  catsscalatracing+ 4

  catsscalatracingopentracinghoneycombjaegercats-effect

  Scala

  •

  MIT License

  •7979 forks•338338 stars•1616 issues•1111 pull requests•Updated Apr 17, 2026Apr 17, 2026

• spire

  Public
  Powerful new number types and numeric abstractions for Scala.

  Scala

  •

  MIT License

  •238238 forks•1.8k1.8k stars•133133 issues•3030 pull requests•Updated Apr 17, 2026Apr 17, 2026

• skunk

  Public
  A data access library for Scala + Postgres.

  catspostgresscala+ 6

  catspostgresscaladatabasefunctional-programmingtypelevelfs2scodeccats-effect

  Scala

  •

  MIT License

  •167167 forks•1.7k1.7k stars•7878 issues•1010 pull requests•Updated Apr 17, 2026Apr 17, 2026

• log4cats-natchez

  Public
  log4cats backend that provides a Logger[F] given a Trace[F] from Natchez

  loggingtracingnatchez+ 1

  loggingtracingnatchezlog4cats

  Scala

  •

  Apache License 2.0

  •22 forks•11 star•00 issues•55 pull requests•Updated Apr 17, 2026Apr 17, 2026

• weaver-test

  Public
  A test framework that runs everything in parallel.

  Scala

  •

  Other

  •1414 forks•8282 stars•2626 issues•1313 pull requests•Updated Apr 17, 2026Apr 17, 2026

• toolkit

  Public
  Quickstart your next app with the Typelevel Toolkit!

  catsscalatoolkit+ 1

  catsscalatoolkitscala-cli

  Scala

  •

  Apache License 2.0

  •99 forks•9898 stars•88 issues•00 pull requests•Updated Apr 17, 2026Apr 17, 2026

• mouse

  Public
  A small companion to cats

  catsscalatypelevel

  catsscalatypelevel

  Scala

  •

  MIT License

  •6666 forks•376376 stars•44 issues•55 pull requests•Updated Apr 16, 2026Apr 16, 2026

• log4cats

  Public
  Logging Tools For Interaction with cats-effect

  Scala

  •

  Apache License 2.0

  •7979 forks•415415 stars•1313 issues•1313 pull requests•Updated Apr 16, 2026Apr 16, 2026

• vault

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

  Scala

  •

  MIT License

  •2020 forks•8484 stars•11 issue•00 pull requests•Updated Apr 16, 2026Apr 16, 2026

• jawn

  Public
  Jawn is for parsing jay-sawn (JSON)

  jsonscala

  jsonscala

  Scala

  •7373 forks•436436 stars•1212 issues•33 pull requests•Updated Apr 16, 2026Apr 16, 2026

• jawn-fs2

  Public
  Integration between jawn and fs2

  Scala

  •

  Other

  •1818 forks•3939 stars•11 issue•22 pull requests•Updated Apr 16, 2026Apr 16, 2026

• cats

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

  Scala

  •

  Other

  •1.2k1.2k forks•5.4k5.4k stars•223223 issues•4747 pull requests•Updated Apr 16, 2026Apr 16, 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•22 pull requests•Updated Apr 16, 2026Apr 16, 2026

• discussions

  Public
  a repository to hold org-wide discussions

  00 forks•00 stars•00 issues•00 pull requests•Updated Apr 15, 2026Apr 15, 2026

• cats-mtl

  Public
  cats transformer type classes.

  catsfunctional-programmingmonad+ 2

  catsfunctional-programmingmonadtypeclassestransformer-typeclasses

  Scala

  •

  Other

  •6565 forks•308308 stars•2121 issues•44 pull requests•Updated Apr 15, 2026Apr 15, 2026

• simulacrum-scalafix

  Public
  Simulacrum as Scalafix rules

  Scala

  •1010 forks•3535 stars•66 issues•66 pull requests•Updated Apr 15, 2026Apr 15, 2026