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Scala repos to contribute to

OpenSrc lists 27 Scala repositories with open issues for new contributors, and 14 of them are first-PR friendly. Between them they have 366 open good first issues and 369 help-wanted issues. The median welcome score is 74/100, and the best-scored right now are lichess-org/lila, playframework/playframework and NVIDIA/cudf-spark. Most are about DevOps & Cloud, Backend & APIs and Databases.

27 repos by best score

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  • lichess-org/lila

    ♞ lichess.org: the forever free, adless and open source chess server ♞

    5good first issues
    • Scala
    • Field: Game Dev
    • Stars:18.8K
    • AGPL-3.0
    • CONTRIBUTING
    • replies in ~9h
    Score86 out of 100 contributor score, very welcomingFirst-PR friendly

  • playframework/playframework

    The Community Maintained High Velocity Web Framework For Java and Scala.

    26good first issues+68 help wanted
    • Scala
    • Field: Web Frontend
    • Stars:12.6K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~15d
    Score85 out of 100 contributor score, very welcoming

  • NVIDIA/cudf-spark

    NVIDIA cuDF for Apache Spark plugin - accelerate Apache Spark with GPUs

    43good first issues
    • Scala
    • Field: Graphics
    • Stars:1K
    • CONTRIBUTING
    Score84 out of 100 contributor score, very welcomingFirst-PR friendly

  • http4s/http4s

    A minimal, idiomatic Scala interface for HTTP

    14good first issues
    • Scala
    • Field: Networking
    • Stars:2.6K
    • Apache-2.0
    • CONTRIBUTING
    Score81 out of 100 contributor score, very welcomingFirst-PR friendly

  • VirtusLab/scala-cli

    Scala CLI is a command-line tool to interact with the Scala language. It lets you compile, run, test, and…

    12good first issues
    • Scala
    • Field: CLI Tools
    • Stars:644
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~4d
    Score81 out of 100 contributor score, very welcoming

  • scalaz/scalaz

    Principled Functional Programming in Scala

    16good first issues
    • Scala
    • Stars:4.7K
    • CONTRIBUTING
    Score80 out of 100 contributor score, very welcomingFirst-PR friendly

  • apache/openwhisk

    Apache OpenWhisk is an open source serverless cloud platform

    19good first issues+28 help wanted
    • Scala
    • Field: DevOps
    • Stars:6.8K
    • Apache-2.0
    • CONTRIBUTING
    Score78 out of 100 contributor score, very welcomingFirst-PR friendly

  • chipsalliance/chisel

    Chisel: A Modern Hardware Design Language

    6good first issues+1 help wanted
    • Scala
    • Field: Embedded
    • Stars:4.8K
    • Apache-2.0
    • CONTRIBUTING
    Score78 out of 100 contributor score, very welcomingFirst-PR friendly

  • llm4s/llm4s

    Agentic and LLM Programming in Scala

    15good first issues+4 help wanted
    • Scala
    • Field: Machine Learning
    • Stars:266
    • MIT
    • CONTRIBUTING
    Score78 out of 100 contributor score, very welcomingFirst-PR friendly

  • spotify/scio

    A Scala API for Apache Beam and Google Cloud Dataflow.

    10good first issues
    • Scala
    • Field: DevOps
    • Field: Machine Learning
    • Stars:2.6K
    • Apache-2.0
    • CONTRIBUTING
    Score77 out of 100 contributor score, very welcomingFirst-PR friendly

  • scalikejdbc/scalikejdbc

    A tidy SQL-based DB access library for Scala developers. This library naturally wraps JDBC APIs and provides…

    15good first issues
    • Scala
    • Field: Databases
    • Field: Backend
    • Stars:1.3K
    • Apache-2.0
    • CONTRIBUTING
    Score75 out of 100 contributor score, very welcomingFirst-PR friendly

  • apache/kyuubi

    Apache Kyuubi is a distributed and multi-tenant gateway to provide serverless SQL on data warehouses and…

    12good first issues+27 help wanted
    • Scala
    • Field: Databases
    • Field: DevOps
    • Stars:2.4K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~30d
    Score74 out of 100 contributor score, welcoming

  • apache/gluten

    Gluten is a middle layer responsible for offloading JVM-based SQL engines' execution to native engines.

    15good first issues
    • Scala
    • Field: Databases
    • Stars:1.6K
    • Apache-2.0
    • CONTRIBUTING
    Score74 out of 100 contributor score, welcomingFirst-PR friendly

  • zio/zio-config

    Easily use and document any config from anywhere in ZIO apps

    11good first issues
    • Scala
    • Stars:244
    • Apache-2.0
    • CONTRIBUTING
    Score74 out of 100 contributor score, welcomingFirst-PR friendly

  • typelevel/cats-effect

    The pure asynchronous runtime for Scala

    7good first issues
    • Scala
    • Stars:2.2K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~6d
    Score73 out of 100 contributor score, welcoming

  • scala/scala3

    The Scala 3 compiler, also known as Dotty.

    3good first issues+16 help wanted
    • Scala
    • Field: Compilers
    • Stars:6.3K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~5h
    Score72 out of 100 contributor score, welcomingFirst-PR friendly

  • firesim/firesim

    FireSim: Fast and Effortless FPGA-accelerated Hardware Simulation with On-Prem and Cloud Flexibility

    17good first issues+1 help wanted
    • Scala
    • Field: DevOps
    • Field: Embedded
    • Stars:1K
    • CONTRIBUTING
    Score72 out of 100 contributor score, welcomingFirst-PR friendly

  • akka/akka-core

    A platform to build and run apps that are elastic, agile, and resilient. SDK, libraries, and hosted…

    4good first issues+200 help wanted
    • Scala
    • Field: DevOps
    • Field: OS
    • Stars:13.3K
    • CONTRIBUTING
    • replies in ~30d
    Score70 out of 100 contributor score, welcoming

  • zio/zio

    ZIO — A type-safe, composable library for async and concurrent programming in Scala

    4good first issues+3 help wanted
    • Scala
    • Stars:4.4K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~30d
    Score69 out of 100 contributor score, welcoming

  • delta-io/delta

    An open-source storage framework that enables building a Lakehouse architecture with compute engines…

    11good first issues
    • Scala
    • Field: Data Science
    • Field: Backend
    • Stars:9K
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~30d
    Score68 out of 100 contributor score, welcoming

  • bitcoin-s/bitcoin-s

    Bitcoin Implementation in Scala

    31good first issues
    • Scala
    • Field: Blockchain
    • Field: Networking
    • Stars:383
    • MIT
    • CONTRIBUTING
    • replies in ~30d
    Score68 out of 100 contributor score, welcoming

  • apache/datafusion-comet

    Apache DataFusion Comet Spark Accelerator

    8good first issues+1 help wanted
    • Scala
    • Stars:1.3K
    • Apache-2.0
    • CONTRIBUTING
    Score67 out of 100 contributor score, welcomingFirst-PR friendly

  • turtles, patches, and links for kids, teachers, and scientists

    5good first issues
    • Scala
    • Stars:1.2K
    • GPL-2.0
    • replies in ~1h
    Score67 out of 100 contributor score, welcoming

  • canton-network/splice

    Splice repository

    9good first issues+2 help wanted
    • Scala
    • Stars:118
    • Apache-2.0
    • CONTRIBUTING
    • replies in ~20d
    Score65 out of 100 contributor score, welcoming

  • reibitto/command-center

    A CLI-based launcher and general productivity tool.

    26good first issues+1 help wanted
    • Scala
    • Field: CLI Tools
    • Stars:109
    • Apache-2.0
    Score65 out of 100 contributor score, welcoming

  • scala-native/scala-native

    Your favorite language gets closer to bare metal.

    4good first issues
    • Scala
    • Field: Compilers
    • Stars:4.7K
    • replies in ~30d
    Score55 out of 100 contributor score, welcoming

  • 7mind/izumi

    Productivity-oriented collection of lightweight fancy stuff for Scala toolchain

    18good first issues+17 help wanted
    • Scala
    • Field: Observability
    • Stars:629
    • BSD-2-Clause
    Score43 out of 100 contributor score, some assembly required