Scala Reactive

Open-source Scala projects categorized as Reactive

Top 17 Scala Reactive Projects

  1. Akka

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

  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.

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  3. Play

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

    Project mention: Deploying a Scala Play Application to Heroku | dev.to | 2025-04-08

    ~/project$ sbt run [info] welcome to sbt 1.10.6 (Ubuntu Java 17.0.14) [info] loading settings for project scala-api-heroku-build from plugins.sbt... [info] loading project definition from /home/alvin/repositories/devspotlight/heroku/scala/scala-api-heroku/project [info] loading settings for project root from build.sbt... [info] loading settings for project docs from build.sbt... [info] __ __ [info] \ \ ____ / /____ _ __ __ [info] \ \ / __ \ / // __ `// / / / [info] / / / /_/ // // /_/ // /_/ / [info] /_/ / .___//_/ \__,_/ \__, / [info] /_/ /____/ [info] [info] Version 3.0.6 running Java 17.0.14 [info] [info] Play is run entirely by the community. Please consider contributing and/or donating: [info] https://www.playframework.com/sponsors [info] --- (Running the application, auto-reloading is enabled) --- INFO p.c.s.PekkoHttpServer - Listening for HTTP on /[0:0:0:0:0:0:0:0]:9000 (Server started, use Enter to stop and go back to the console...)

  4. Lagom

    Reactive Microservices for the JVM

  5. Reactive-kafka

    Alpakka Kafka connector - Alpakka is a Reactive Enterprise Integration library for Java and Scala, based on Reactive Streams and Akka.

  6. Akka HTTP

    The Streaming-first HTTP server/module of Akka

  7. pekko

    Build highly concurrent, distributed, and resilient message-driven applications using Java/Scala

    Project mention: Hydro: Distributed Programming Framework for Rust | news.ycombinator.com | 2025-01-31

    Seems like it based on GH activity, but I don’t know for sure.

    https://github.com/apache/pekko

  8. alpakka

    Alpakka is a Reactive Enterprise Integration library for Java and Scala, based on Reactive Streams and Akka.

  9. 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
  10. Phantom

    Schema safe, type-safe, reactive Scala driver for Cassandra/Datastax Enterprise

  11. ReactiveMongo

    :leaves: Non-blocking, Reactive MongoDB Driver for Scala

  12. topshell

    TopShell - a purely functional, reactive scripting language

  13. OutWatch

    The Functional and Reactive Web-Frontend Library for Scala.js

  14. AkkaGRPC

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

  15. aecor

    Pure functional event sourcing runtime

  16. Pulsar4s

    Idiomatic, typesafe, and reactive Scala client for Apache Pulsar

  17. Play WS

    Standalone Play WS, an async HTTP client with fluent API

  18. lila-ws

    Lichess' websocket server

  19. Clickhouse-scala-client

    Clickhouse Scala Client with Reactive Streams support

  20. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub 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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    SaaSHub helps you find the best software and product alternatives Learn more →

Index

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

# Project Stars
1 Akka 13,144
2 Play 12,564
3 Lagom 2,631
4 Reactive-kafka 1,416
5 Akka HTTP 1,336
6 pekko 1,340
7 alpakka 1,264
8 Phantom 1,046
9 ReactiveMongo 850
10 topshell 480
11 OutWatch 469
12 AkkaGRPC 432
13 aecor 324
14 Pulsar4s 230
15 Play WS 225
16 lila-ws 159
17 Clickhouse-scala-client 116

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