Repositories list

• cats-collections

  Public
  Data structures for pure functional programming in Scala

  Scala

  •

  Other

  •108108 forks•564564 stars•1515 issues•1010 pull requests•Updated Jun 10, 2026Jun 10, 2026

• cats-effect

  Public
  The pure asynchronous runtime for Scala

  scalaasynchronouseffects+ 2

  scalaasynchronouseffectsfptypeclasses

  Scala

  •

  Apache License 2.0

  •573573 forks•2.2k2.2k stars•199199 issues•2929 pull requests•Updated Jun 10, 2026Jun 10, 2026

• cats

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

  Scala

  •

  Other

  •1.2k1.2k forks•5.4k5.4k stars•223223 issues•5050 pull requests•Updated Jun 9, 2026Jun 9, 2026

• scalac-options

  Public
  A library for configuring scalac options

  Scala

  •

  Apache License 2.0

  •1818 forks•4848 stars•66 issues•66 pull requests•Updated Jun 9, 2026Jun 9, 2026

• scalac-compat

  Public
  Lightweight tools for tackling Scalac version incompatibilities

  Scala

  •

  Apache License 2.0

  •44 forks•99 stars•00 issues•11 pull request•Updated Jun 9, 2026Jun 9, 2026

• weaver-test

  Public
  A test framework that runs everything in parallel.

  Scala

  •

  Other

  •1515 forks•8484 stars•2424 issues•44 pull requests•Updated Jun 9, 2026Jun 9, 2026

• typelevel.g8

  Public
  A typelevel.g8 based on sbt-typelevel

  scalasbtgiter8

  scalasbtgiter8

  Scala

  •66 forks•1414 stars•88 issues•00 pull requests•Updated Jun 9, 2026Jun 9, 2026

• doobie

  Public
  Functional JDBC layer for Scala.

  scaladatabasefunctional-programming+ 3

  scaladatabasefunctional-programmingjdbctypelevelfp

  Scala

  •

  MIT License

  •377377 forks•2.2k2.2k stars•127127 issues•77 pull requests•Updated Jun 9, 2026Jun 9, 2026

• kittens

  Public
  Automatic type class derivation for Cats

  Scala

  •

  Apache License 2.0

  •6767 forks•546546 stars•77 issues•22 pull requests•Updated Jun 9, 2026Jun 9, 2026

• vulcan

  Public
  Functional Avro for Scala

  scalaavro

  scalaavro

  Scala

  •

  Apache License 2.0

  •3636 forks•105105 stars•11 issue•22 pull requests•Updated Jun 9, 2026Jun 9, 2026

• twiddles

  Public
  Micro-library for building effectful protocols

  scalatypelevelfp

  scalatypelevelfp

  Scala

  •

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

  •44 forks•7070 stars•00 issues•55 pull requests•Updated Jun 9, 2026Jun 9, 2026

• sbt-typelevel

  Public
  Let sbt work for you.

  scalasbttypelevel+ 1

  scalasbttypelevelsbt-plugin

  Scala

  •

  Apache License 2.0

  •5858 forks•184184 stars•6565 issues•2222 pull requests•Updated Jun 9, 2026Jun 9, 2026

• saslprep

  Public
  Cross-platform implementation of SASLprep

  Scala

  •

  Apache License 2.0

  •11 fork•00 stars•00 issues•55 pull requests•Updated Jun 9, 2026Jun 9, 2026

• otel4s-sdk

  Public
  Implementation of the otel4s SDK modules in Scala from scratch

  typeleveltracingobservability+ 3

  typeleveltracingobservabilitycats-effectopentelemetryotel4s

  Scala

  •

  Apache License 2.0

  •22 forks•66 stars•66 issues•22 pull requests•Updated Jun 9, 2026Jun 9, 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•33 pull requests•Updated Jun 9, 2026Jun 9, 2026

• otel4s

  Public
  An OpenTelemetry library for Scala based on Cats-Effect

  catsscalametrics+ 4

  catsscalametricstypeleveltracingcats-effectopentelemetry

  Scala

  •

  Apache License 2.0

  •5050 forks•212212 stars•55 issues•44 pull requests•Updated Jun 9, 2026Jun 9, 2026

• natchez

  Public
  functional tracing for cats

  catsscalatracing+ 4

  catsscalatracingopentracinghoneycombjaegercats-effect

  Scala

  •

  MIT License

  •7979 forks•341341 stars•1616 issues•1010 pull requests•Updated Jun 9, 2026Jun 9, 2026

• munit-cats-effect

  Public
  Integration library for MUnit & cats-effect

  Scala

  •

  Apache License 2.0

  •3838 forks•158158 stars•44 issues•33 pull requests•Updated Jun 9, 2026Jun 9, 2026

• mouse

  Public
  A small companion to cats

  catsscalatypelevel

  catsscalatypelevel

  Scala

  •

  MIT License

  •6666 forks•376376 stars•44 issues•44 pull requests•Updated Jun 9, 2026Jun 9, 2026

• literally

  Public
  Compile time validation of literal values built from strings

  Scala

  •

  Apache License 2.0

  •66 forks•113113 stars•11 issue•11 pull request•Updated Jun 9, 2026Jun 9, 2026

• keypool

  Public
  A Keyed Pool Implementation for Scala

  Scala

  •

  MIT License

  •1616 forks•3939 stars•88 issues•77 pull requests•Updated Jun 9, 2026Jun 9, 2026

• jawn-fs2

  Public
  Integration between jawn and fs2

  Scala

  •

  Other

  •1818 forks•3939 stars•11 issue•11 pull request•Updated Jun 9, 2026Jun 9, 2026

• idna4s

  Public
  Cross-platform Scala implementation of Internationalized Domain Names in Applications

  Scala

  •

  MIT License

  •44 forks•77 stars•55 issues•55 pull requests•Updated Jun 9, 2026Jun 9, 2026

• grackle

  Public
  Grackle: Functional GraphQL for the Typelevel stack

  Scala

  •

  Apache License 2.0

  •3131 forks•188188 stars•2323 issues•33 pull requests•Updated Jun 9, 2026Jun 9, 2026

• cats-time

  Public
  Cats Instances for Java Time

  Scala

  •

  MIT License

  •2020 forks•9494 stars•11 issue•22 pull requests•Updated Jun 9, 2026Jun 9, 2026

• cats-parse

  Public
  A parsing library for the cats ecosystem

  Scala

  •

  MIT License

  •5151 forks•245245 stars•1818 issues•1414 pull requests•Updated Jun 9, 2026Jun 9, 2026

• foundation

  Public
  governance for the Typelevel Foundation

  11 fork•00 stars•33 issues•11 pull request•Updated Jun 8, 2026Jun 8, 2026

• scalacheck

  Public
  Property-based testing for Scala

  scalascalacheckproperty-testing

  scalascalacheckproperty-testing

  Scala

  •

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

  •396396 forks•2k2k stars•5454 issues•1111 pull requests•Updated Jun 7, 2026Jun 7, 2026

• skunk

  Public
  A data access library for Scala + Postgres.

  catspostgresscala+ 6

  catspostgresscaladatabasefunctional-programmingtypelevelfs2scodeccats-effect

  Scala

  •

  MIT License

  •174174 forks•1.7k1.7k stars•7979 issues•1414 pull requests•Updated Jun 5, 2026Jun 5, 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•77 pull requests•Updated Jun 5, 2026Jun 5, 2026