Scala Kotlin

Open-source Scala projects categorized as Kotlin

Top 5 Scala Kotlin Projects

  1. Gatling

    Modern Load Testing as Code

    Project mention: Outgrowing Postgres: How to identify scale problems | dev.to | 2025-02-03

    Use load testing tools like Apache JMeter, Gatling, or Locust to measure your application's throughput under various loads and compare it to historical data.

  2. InfluxDB

    InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.

    InfluxDB logo
  3. Mill

    Mill is a fast JVM build tool that supports Java, Scala, Kotlin and many other languages. 2-4x faster than Gradle and 4-10x faster than Maven for common workflows, Mill aims to make your project’s build process performant, maintainable, and flexible

    Project mention: The next generation of Bazel builds | news.ycombinator.com | 2025-04-10

    A big problem with Bazel not mentioned here is the complexity. It's just really hard for many people to grasp, and adopting Bazel at the two places I worked was a ~10 person-year effort for the rollout with ongoing maintenance after. That's a lot of effort!

    IMO Bazel has a lot of good ideas to it: hierarchical graph-based builds, pure hermetic build steps, and so on. Especially at the time, these were novel ideas. But in Bazel they are buried behind a sea of other concepts that may not be so critical: `query` vs `aquery` vs `cquery`, action-graph vs target-graph, providers vs outputs, etc. Some of these are necessary for ultra-large-scale builds, some are compromises due to legacy, but for the vast majority of non-Google-scale companies there may be a better way.

    But I'm hoping the next generation of build tools can simplify things enough that you don't need a person-decade of engineering work to adopt it. My own OSS project Mill (https://mill-build.org/) is one attempt in that direction, by re-using ideas from functional and object-oriented programming to hopefully make build graphs easier to describe and work with

  4. SwayDB

    Persistent and in-memory key-value storage engine for JVM that scales on a single machine.

  5. stasis

    Backup and recovery system with emphasis on security and privacy (by sndnv)

  6. bazel-multiversion

    Bazel rules to resolve, fetch and manage 3rdparty JVM dependencies with support for multiple parallel versions of the same dependency. Powered by Coursier.

  7. CodeRabbit

    CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.

    CodeRabbit logo
NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

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Scala Kotlin related posts

  • Scala 3 Migration: Report from the Field

    4 projects | news.ycombinator.com | 6 Feb 2025
  • [Request] Open source large (web/mobile) projects with best practices

    3 projects | /r/ExperiencedDevs | 1 Jun 2021
  • Scala is a Maintenance Nightmare

    5 projects | /r/programming | 22 Mar 2021

Index

What are some of the best open-source Kotlin projects in Scala? This list will help you:

# Project Stars
1 Gatling 6,623
2 Mill 2,381
3 SwayDB 293
4 stasis 94
5 bazel-multiversion 49

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