Repositories list

• cats-collections

  Public
  Data structures for pure functional programming in Scala

  Scala

  •

  Other

  •102•563•14•3•Updated Feb 4, 2026Feb 4, 2026

• typelevel.g8

  Public
  A typelevel.g8 based on sbt-typelevel

  scalasbtgiter8

  Scala

  •6•15•8•0•Updated Feb 4, 2026Feb 4, 2026

• scalacheck-effect

  Public
  Effectful property testing built on ScalaCheck

  Scala

  •

  Apache License 2.0

  •26•83•6•2•Updated Feb 4, 2026Feb 4, 2026

• scalacheck

  Public
  Property-based testing for Scala

  scalascalacheckproperty-testing

  Scala

  •

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

  •399•2k•54•9•Updated Feb 4, 2026Feb 4, 2026

• scalac-options

  Public
  A library for configuring scalac options

  Scala

  •

  Apache License 2.0

  •15•46•6•4•Updated Feb 4, 2026Feb 4, 2026

• scalac-compat

  Public
  Lightweight tools for tackling Scalac version incompatibilities

  Scala

  •

  Apache License 2.0

  •3•9•0•0•Updated Feb 4, 2026Feb 4, 2026

• discipline-scalatest

  Public
  ScalaTest binding for Discipline

  Scala

  •

  MIT License

  •17•20•1•1•Updated Feb 4, 2026Feb 4, 2026

• discipline-munit

  Public
  MUnit binding for Typelevel Discipline

  Scala

  •15•25•1•1•Updated Feb 4, 2026Feb 4, 2026

• shapeless-3

  Public
  Generic programming for Scala

  Scala

  •25•199•5•1•Updated Feb 4, 2026Feb 4, 2026

• natchez

  Public
  functional tracing for cats

  catsscalatracing+ 4opentracinghoneycombjaegercats-effect

  Scala

  •

  MIT License

  •78•339•16•12•Updated Feb 4, 2026Feb 4, 2026

• natchez-http4s

  Public
  Glorious integration layer for Natchez and Http4s.

  Scala

  •

  MIT License

  •19•50•4•4•Updated Feb 4, 2026Feb 4, 2026

• kittens

  Public
  Automatic type class derivation for Cats

  Scala

  •

  Apache License 2.0

  •66•546•7•2•Updated Feb 4, 2026Feb 4, 2026

• cats-tagless

  Public
  Library of utilities for tagless final encoded algebras

  scalafunctional-programmingtagless

  Scala

  •

  Apache License 2.0

  •43•323•9•6•Updated Feb 4, 2026Feb 4, 2026

• weaver-test

  Public
  A test framework that runs everything in parallel.

  Scala

  •

  Other

  •13•78•26•12•Updated Feb 4, 2026Feb 4, 2026

• vault

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

  Scala

  •

  MIT License

  •20•82•1•1•Updated Feb 4, 2026Feb 4, 2026

• typelevel-scalafix

  Public
  Scalafix rules for Typelevel projects

  Scala

  •

  Apache License 2.0

  •8•26•18•11•Updated Feb 4, 2026Feb 4, 2026

• twiddles

  Public

  typelevel/twiddles’s past year of commit activity
  Micro-library for building effectful protocols

  scalatypelevelfp

  Scala

  •

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

  •4•69•1•3•Updated Feb 4, 2026Feb 4, 2026

• toolkit

  Public
  Quickstart your next app with the Typelevel Toolkit!

  catsscalatoolkit+ 1scala-cli

  Scala

  •

  Apache License 2.0

  •9•97•8•13•Updated Feb 4, 2026Feb 4, 2026

• simulacrum-scalafix

  Public
  Simulacrum as Scalafix rules

  Scala

  •10•34•6•6•Updated Feb 4, 2026Feb 4, 2026

• skunk

  Public
  A data access library for Scala + Postgres.

  catspostgresscala+ 6databasefunctional-programmingtypelevelfs2scodeccats-effect

  Scala

  •

  MIT License

  •166•1.6k•77•11•Updated Feb 4, 2026Feb 4, 2026

• scalacheck-xml

  Public
  Scalacheck instances for scala-xml

  Scala

  •1•5•0•3•Updated Feb 4, 2026Feb 4, 2026

• paiges

  Public
  an implementation of Wadler's a prettier printer

  scalalayoutpretty-print

  Scala

  •

  Apache License 2.0

  •30•189•5•13•Updated Feb 4, 2026Feb 4, 2026

• otel4s-sdk

  Public
  Implementation of the otel4s SDK modules in Scala from scratch

  typeleveltracingobservability+ 3cats-effectopentelemetryotel4s

  Scala

  •

  Apache License 2.0

  •1•5•5•4•Updated Feb 4, 2026Feb 4, 2026

• otel4s-experimental

  Public
  A companion project for exploring experimental features in otel4s

  typelevelcats-effectopentelemetry+ 1otel4s

  Scala

  •

  Apache License 2.0

  •2•7•0•8•Updated Feb 4, 2026Feb 4, 2026

• otel4s

  Public
  An OpenTelemetry library for Scala based on Cats-Effect

  catsscalametrics+ 4typeleveltracingcats-effectopentelemetry

  Scala

  •

  Apache License 2.0

  •45•204•14•5•Updated Feb 4, 2026Feb 4, 2026

• munit-cats-effect

  Public
  Integration library for MUnit & cats-effect

  Scala

  •

  Apache License 2.0

  •38•154•5•3•Updated Feb 4, 2026Feb 4, 2026

• mouse

  Public
  A small companion to cats

  catsscalatypelevel

  Scala

  •

  MIT License

  •66•376•4•4•Updated Feb 4, 2026Feb 4, 2026

• monoids

  Public
  Generic Monoids for Scala

  Scala

  •

  MIT License

  •12•52•1•6•Updated Feb 4, 2026Feb 4, 2026

• log4cats-natchez

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

  loggingtracingnatchez+ 1log4cats

  Scala

  •

  Apache License 2.0

  •2•1•0•8•Updated Feb 4, 2026Feb 4, 2026

• log4cats

  Public
  Logging Tools For Interaction with cats-effect

  Scala

  •

  Apache License 2.0

  •79•417•13•14•Updated Feb 4, 2026Feb 4, 2026