Top Scala repositories on GitHub
JVM language blending object-oriented and functional paradigms.
Ranked by stars across 1,723 Scala repositories on GitHub. Refreshed daily.
- 1twitter/the-algorithm★ 73,113 · ⑂ 13,259
Source code for the X Recommendation Algorithm
- 2apache/spark★ 43,240 · ⑂ 29,170
Apache Spark - A unified analytics engine for large-scale data processing
- python
- scala
- r
- java
- big-data
- jdbc
- 3lichess-org/lila★ 18,162 · ⑂ 2,651
♞ lichess.org: the forever free, adless and open source chess server ♞
- scala
- chess
- play-framework
- non-profit
- functional-programming
- type-safe
- 4prisma/prisma1★ 16,403 · ⑂ 841
💾 Database Tools incl. ORM, Migrations and Admin UI (Postgres, MySQL & MongoDB) [deprecated]
- orm
- database
- graphql
- datamapper
- serverless
- dao
- 5scala/scala★ 14,449 · ⑂ 3,088
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
- 6akka/akka-core★ 13,279 · ⑂ 3,550
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
- 7playframework/playframework★ 12,622 · ⑂ 4,036
The Community Maintained High Velocity Web Framework For Java and Scala.
- scala
- java
- reactive
- web-framework
- restful
- play
- 8apache/predictionio★ 12,529 · ⑂ 1,908
PredictionIO, a machine learning server for developers and ML engineers.
- scala
- big-data
- predictionio
- 9rtyley/bfg-repo-cleaner★ 12,102 · ⑂ 580
Removes large or troublesome blobs like git-filter-branch does, but faster. And written in Scala
- git
- 10yahoo/CMAK★ 11,934 · ⑂ 2,488
CMAK is a tool for managing Apache Kafka clusters
- kafka
- scala
- cluster-management
- big-data
- 11gitbucket/gitbucket★ 9,372 · ⑂ 1,262
A Git platform powered by Scala with easy installation, high extensibility & GitHub API compatibility
- scala
- gitbucket
- git
- scalatra
- 12twitter/finagle★ 8,869 · ⑂ 1,437
A fault tolerant, protocol-agnostic RPC system
- rpc
- distributed-systems
- finagle
- http
- http2
- thrift
- 13delta-io/delta★ 8,772 · ⑂ 2,087
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
- 14twitter-archive/snowflake★ 7,771 · ⑂ 1,118
Snowflake is a network service for generating unique ID numbers at high scale with some simple guarantees.
- 15snowplow/snowplow★ 7,014 · ⑂ 1,177
The leader in Customer Data Infrastructure
- snowplow
- analytics
- data
- data-pipeline
- data-collection
- product-analytics
- 16OpenXiangShan/XiangShan★ 7,000 · ⑂ 901
Open-source high-performance RISC-V processor
- risc-v
- microarchitecture
- chisel
- 17gatling/gatling★ 6,898 · ⑂ 1,209
Modern Load Testing as Code
- netty
- scala
- loadtesting
- automation
- gatling
- load-testing
- 18lhartikk/ArnoldC★ 6,870 · ⑂ 295
Arnold Schwarzenegger based programming language
- 19apache/openwhisk★ 6,771 · ⑂ 1,174
Apache OpenWhisk is an open source serverless cloud platform
- openwhisk
- apache
- serverless
- cloud
- faas
- functions-as-a-service
- 20
- 21
- 22fpinscala/fpinscala★ 5,822 · ⑂ 3,030
Code, exercises, answers, and hints to go along with the book "Functional Programming in Scala"
- 23typelevel/cats★ 5,435 · ⑂ 1,239
Lightweight, modular, and extensible library for functional programming.
- 24linkerd/linkerd★ 5,324 · ⑂ 496
Old repo for Linkerd 1.x. See the linkerd2 repo for Linkerd 2.x.
- cloud-native
- service-mesh
- linkerd
- service-discovery
- 25microsoft/SynapseML★ 5,226 · ⑂ 861
Simple and Distributed Machine Learning
- spark
- pyspark
- azure
- scala
- microsoft
- ml
Find Scala engineers and maintainers
The list above ranks the most-starred public Scala repositories, drawn from the public GitHub graph. Across 1,723 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 Scalaproject is a small group of people who actually shipped it. They’re the Scalaengineers, 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.
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Last refreshed: Thu, 07 May 2026 05:55:37 GMT
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