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Top Scala repositories on GitHub

JVM language blending object-oriented and functional paradigms.

Ranked by stars across 1,733 Scala repositories on GitHub. Refreshed daily.

  1. 1
    twitter/the-algorithm★ 73,917 · ⑂ 13,282

    Source code for the X Recommendation Algorithm

  2. 2
    apache/spark★ 44,010 · ⑂ 29,387

    Apache Spark - A unified analytics engine for large-scale data processing

    • python
    • scala
    • r
    • java
    • big-data
    • jdbc
  3. 3
    lichess-org/lila★ 18,742 · ⑂ 2,789

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

    • scala
    • chess
    • play-framework
    • non-profit
    • functional-programming
    • type-safe
  4. 4
    prisma/prisma1★ 16,376 · ⑂ 839

    💾 Database Tools incl. ORM, Migrations and Admin UI (Postgres, MySQL & MongoDB) [deprecated]

    • orm
    • database
    • graphql
    • datamapper
    • serverless
    • dao
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  6. 5
    scala/scala★ 14,560 · ⑂ 3,218

    Scala 2 compiler and standard library. Scala 2 bugs at https://github.com/scala/bug; Scala 3 at https://github.com/scala/scala3

    • scala
    • scala-compiler
    • scala-programming-language
    • scala-library
    • jvm-languages
    • functional-programming
  7. 6
    akka/akka-core★ 13,279 · ⑂ 3,534

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

    • reactive
    • distributed-systems
    • concurrency
    • high-performance
    • akka
    • actor-model
  8. 7
    playframework/playframework★ 12,618 · ⑂ 4,020

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

    • scala
    • java
    • reactive
    • web-framework
    • restful
    • play
  9. 8
    apache/predictionio★ 12,518 · ⑂ 1,892

    PredictionIO, a machine learning server for developers and ML engineers.

    • scala
    • big-data
    • predictionio
  10. 9
    rtyley/bfg-repo-cleaner★ 12,190 · ⑂ 583

    Removes large or troublesome blobs like git-filter-branch does, but faster. And written in Scala

    • git
  11. 10
    yahoo/CMAK★ 11,923 · ⑂ 2,472

    CMAK is a tool for managing Apache Kafka clusters

    • kafka
    • scala
    • cluster-management
    • big-data
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  13. 11
    gitbucket/gitbucket★ 9,405 · ⑂ 1,268

    A Git platform powered by Scala with easy installation, high extensibility & GitHub API compatibility

    • scala
    • gitbucket
    • git
    • scalatra
  14. 12
    delta-io/delta★ 9,000 · ⑂ 2,176

    An open-source storage framework that enables building a Lakehouse architecture with compute engines including Spark, PrestoDB, Flink, Trino, and Hive and APIs

    • spark
    • acid
    • big-data
    • analytics
    • delta-lake
  15. 13
    twitter/finagle★ 8,866 · ⑂ 1,428

    A fault tolerant, protocol-agnostic RPC system

    • rpc
    • distributed-systems
    • finagle
    • http
    • http2
    • thrift
  16. 14
    twitter-archive/snowflake★ 7,760 · ⑂ 1,110

    Snowflake is a network service for generating unique ID numbers at high scale with some simple guarantees.

  17. 15
    OpenXiangShan/XiangShan★ 7,262 · ⑂ 944

    Open-source high-performance RISC-V processor

    • risc-v
    • microarchitecture
    • chisel
  18. 16
    snowplow/snowplow★ 7,034 · ⑂ 1,172

    The leader in Customer Data Infrastructure

    • snowplow
    • analytics
    • data
    • data-pipeline
    • data-collection
    • product-analytics
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  20. 17
    gatling/gatling★ 6,956 · ⑂ 1,207

    Modern Load Testing as Code

    • netty
    • scala
    • loadtesting
    • automation
    • gatling
    • load-testing
  21. 18
    lhartikk/ArnoldC★ 6,883 · ⑂ 293

    Arnold Schwarzenegger based programming language

  22. 19
    apache/openwhisk★ 6,796 · ⑂ 1,180

    Apache OpenWhisk is an open source serverless cloud platform

    • openwhisk
    • apache
    • serverless
    • cloud
    • faas
    • functions-as-a-service
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Find Scala engineers and maintainers

The list above ranks the most-starred public Scala repositories, drawn from the public GitHub graph. Across 1,733 Scala repositories in the public graph, the maintainers, top contributors, and recurring committers are a powerful signal for where Scala expertise lives.

Behind every popular Scala project is a small group of people who actually shipped it. They’re the Scala engineers, library authors, and infrastructure builders worth knowing - whether you’re hiring, partnering, or doing technical research.

Refolk turns this list into a search. Ask for “Scala maintainers hiring”, “contributors to Scala repos based in Europe”, or “companies whose engineers ship Scala” and Refolk returns a ranked shortlist with the commits, repos, and profiles that earned each person a spot.

How this list is built

Refolk searched GitHub for public repositories whose primary language is Scala, ranked them by stargazer count, and kept those with at least 100 stars. The list refreshes once a day.

Last refreshed: Fri, 18 Sep 2026 14:15:34 GMT

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How are these repositories ranked?

By stars, with forks and recent activity as tiebreakers, read from the public GitHub API. The methodology section above has the details.

How fresh is the data?

The ranking re-renders at least daily. Last refreshed: Fri, 18 Sep 2026 14:15:34 GMT.

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Yes. Stars rank the projects; I can rank the engineers - maintainers, top contributors, and the people they work with. You start with 500 free credits, no card required.

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  2. 02I read the web live

    GitHub, public LinkedIn and Crunchbase records, the open web. Not a database that went stale last quarter.

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