Repositories list

• simulacrum-scalafix

  Public
  Simulacrum as Scalafix rules

  Scala

  •1010 forks•3636 stars•66 issues•77 pull requests•Updated Sep 20, 2026Sep 20, 2026

• cats

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

  Scala

  •

  Other

  •1.2k1.2k forks•5.5k5.5k stars•224224 issues•6060 pull requests•Updated Sep 20, 2026Sep 20, 2026

• natchez

  Public
  functional tracing for cats

  catsscalatracing+ 4

  catsscalatracingopentracinghoneycombjaegercats-effect

  Scala

  •

  MIT License

  •7676 forks•340340 stars•1616 issues•1717 pull requests•Updated Sep 19, 2026Sep 19, 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 Sep 19, 2026Sep 19, 2026

• otel4s-experimental

  Public
  A companion project for exploring experimental features in otel4s

  typelevelcats-effectopentelemetry+ 1

  typelevelcats-effectopentelemetryotel4s

  Scala

  •

  Apache License 2.0

  •33 forks•88 stars•11 issue•22 pull requests•Updated Sep 19, 2026Sep 19, 2026

• grackle

  Public
  Grackle: Functional GraphQL for the Typelevel stack

  Scala

  •

  Apache License 2.0

  •3232 forks•189189 stars•2222 issues•55 pull requests•Updated Sep 19, 2026Sep 19, 2026

• otel4s

  Public
  An OpenTelemetry library for Scala based on Cats-Effect

  catsscalametrics+ 4

  catsscalametricstypeleveltracingcats-effectopentelemetry

  Scala

  •

  Apache License 2.0

  •4949 forks•215215 stars•77 issues•11 pull request•Updated Sep 19, 2026Sep 19, 2026

• vault

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

  Scala

  •

  MIT License

  •2020 forks•8484 stars•11 issue•44 pull requests•Updated Sep 19, 2026Sep 19, 2026

• log4cats

  Public
  Logging Tools For Interaction with cats-effect

  Scala

  •

  Apache License 2.0

  •7777 forks•416416 stars•1313 issues•1717 pull requests•Updated Sep 19, 2026Sep 19, 2026

• keypool

  Public
  A Keyed Pool Implementation for Scala

  Scala

  •

  MIT License

  •1818 forks•3939 stars•99 issues•1212 pull requests•Updated Sep 19, 2026Sep 19, 2026

• doobie

  Public
  Functional JDBC layer for Scala.

  scaladatabasefunctional-programming+ 3

  scaladatabasefunctional-programmingjdbctypelevelfp

  Scala

  •

  MIT License

  •379379 forks•2.2k2.2k stars•127127 issues•1313 pull requests•Updated Sep 19, 2026Sep 19, 2026

• natchez-http4s

  Public
  Glorious integration layer for Natchez and Http4s.

  Scala

  •

  MIT License

  •1818 forks•5050 stars•44 issues•1313 pull requests•Updated Sep 19, 2026Sep 19, 2026

• typelevel.g8

  Public
  A typelevel.g8 based on sbt-typelevel

  scalasbtgiter8

  scalasbtgiter8

  Scala

  •77 forks•1414 stars•88 issues•55 pull requests•Updated Sep 19, 2026Sep 19, 2026

• skunk

  Public
  A data access library for Scala + Postgres.

  catspostgresscala+ 6

  catspostgresscaladatabasefunctional-programmingtypelevelfs2scodeccats-effect

  Scala

  •

  MIT License

  •175175 forks•1.7k1.7k stars•7575 issues•1515 pull requests•Updated Sep 19, 2026Sep 19, 2026

• Laika

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

  Scala

  •

  Apache License 2.0

  •5757 forks•454454 stars•1212 issues•2323 pull requests•Updated Sep 19, 2026Sep 19, 2026

• jawn-fs2

  Public
  Integration between jawn and fs2

  Scala

  •

  Other

  •1818 forks•4040 stars•11 issue•55 pull requests•Updated Sep 19, 2026Sep 19, 2026

• fs2-grpc

  Public
  gRPC implementation for FS2/cats-effect

  Scala

  •

  MIT License

  •6666 forks•284284 stars•99 issues•66 pull requests•Updated Sep 19, 2026Sep 19, 2026

• fs2

  Public
  Compositional, streaming I/O library for Scala

  scalastreamfunctional-programming+ 2

  scalastreamfunctional-programmingfpstreaming-computation

  Scala

  •

  Other

  •636636 forks•2.5k2.5k stars•103103 issues•3737 pull requests•Updated Sep 19, 2026Sep 19, 2026

• feral

  Public
  Feral cats are homeless, feral functions are serverless

  Scala

  •

  Apache License 2.0

  •5353 forks•195195 stars•3131 issues•4646 pull requests•Updated Sep 19, 2026Sep 19, 2026

• ce3.g8

  Public
  Scala

  •99 forks•3030 stars•00 issues•77 pull requests•Updated Sep 19, 2026Sep 19, 2026

• cats-effect-direct

  Public
  Direct-style async/await syntax for Cats Effect

  Scala

  •

  Apache License 2.0

  •1414 forks•105105 stars•55 issues•1212 pull requests•Updated Sep 19, 2026Sep 19, 2026

• munit-cats-effect

  Public
  Integration library for MUnit & cats-effect

  Scala

  •

  Apache License 2.0

  •4040 forks•159159 stars•44 issues•22 pull requests•Updated Sep 19, 2026Sep 19, 2026

• foundation

  Public
  governance for the Typelevel Foundation

  11 fork•00 stars•33 issues•00 pull requests•Updated Sep 19, 2026Sep 19, 2026

• cats-effect

  Public
  The pure asynchronous runtime for Scala

  scalaasynchronouseffects+ 2

  scalaasynchronouseffectsfptypeclasses

  Scala

  •

  Apache License 2.0

  •576576 forks•2.2k2.2k stars•198198 issues•3232 pull requests•Updated Sep 18, 2026Sep 18, 2026

• typelevel.github.com

  Public
  typelevel.org website

  HTML

  •115115 forks•4242 stars•2424 issues•1010 pull requests•Updated Sep 18, 2026Sep 18, 2026

• sbt-typelevel

  Public
  Let sbt work for you.

  scalasbttypelevel+ 1

  scalasbttypelevelsbt-plugin

  Scala

  •

  Apache License 2.0

  •6262 forks•185185 stars•6767 issues•3737 pull requests•Updated Sep 18, 2026Sep 18, 2026

• cats-testkit-scalatest

  Public
  Cats Testkit for Scalatest

  Scala

  •

  MIT License

  •88 forks•1919 stars•22 issues•3232 pull requests•Updated Sep 18, 2026Sep 18, 2026

• typelevel-scalafix

  Public
  Scalafix rules for Typelevel projects

  Scala

  •

  Apache License 2.0

  •88 forks•2727 stars•1818 issues•1313 pull requests•Updated Sep 17, 2026Sep 17, 2026

• toolkit

  Public
  Quickstart your next app with the Typelevel Toolkit!

  catsscalatoolkit+ 1

  catsscalatoolkitscala-cli

  Scala

  •

  Apache License 2.0

  •99 forks•101101 stars•88 issues•1414 pull requests•Updated Sep 17, 2026Sep 17, 2026

• tsc

  Public
  Technical Steering Committee

  Creative Commons Attribution 4.0 International

  •44 forks•1111 stars•2424 issues•00 pull requests•Updated Sep 16, 2026Sep 16, 2026