Code Quality Rank: L1
Programming language: Java
License: GNU General Public License v3.0 or later
Latest version: v0.8.0

Quasar alternatives and similar libraries

Based on the "Distributed Applications" category.
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QuasarFibers, Channels and Actors for the JVM

Build Status Version License License

Getting started

Add the following Maven/Gradle dependencies:

Feature Artifact
Core (required) co.paralleluniverse:quasar-core:0.8.0
Actors co.paralleluniverse:quasar-actors:0.8.0
Reactive Streams co.paralleluniverse:quasar-reactive-streams:0.8.0
Disruptor Channels co.paralleluniverse:quasar-disruptor:0.8.0
Kotlin (JDK8+) co.paralleluniverse:quasar-kotlin:0.8.0

Or, build from sources by running:

./gradlew install


You can also study the examples here.

You can also read the introductory blog post.

When running code that uses Quasar, the instrumentation agent must be run by adding this to the java command line:


Related Projects

  • Pulsar is Quasar's extra-cool Clojure API
  • Comsat integrates Quasar with the JVM's web APIs

Getting help

Please make sure to double-check the System Requirements and Troubleshooting sections of the docs, as well as at currently open issues.

Questions and suggestions are welcome at this forum/mailing list.

You can also open a new GitHub issue especially for bug reports and feature requests but if you're not sure please first get in touch with the community through the forum/mailing list.

Contributions (including Pull Requests)

Please have a look at some brief information for contributors.


Quasar is free software published under the following license:

Copyright (c) 2013-2018, Parallel Universe Software Co. All rights reserved.

This program and the accompanying materials are dual-licensed under
either the terms of the Eclipse Public License v1.0 as published by
the Eclipse Foundation

  or (per the licensee's choosing)

under the terms of the GNU Lesser General Public License version 3.0
as published by the Free Software Foundation.

*Note that all licence references and agreements mentioned in the Quasar README section above are relevant to that project's source code only.