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Actor toolkits

Actor-model runtimes for building concurrent and distributed JVM applications.

Side by side

Actor toolkits
ToolStarsLicenceTermsSelf-hostedLanguageLatestLast push
Vert.x15kOtherOpen sourceNoJava5.2.02026-10-06
Akka13kOtherSource availableNoScalav2.10.232026-10-05
Apache Pekko1.6kApache-2.0Open sourceNoScalav1.7.12026-10-05

3 tools

Vert.x

Vert.x is a tool-kit for building reactive applications on the JVM

Language
Java
Licence
Other
Stars
15k
Latest
5.2.0
Last push
2026-10-06
Akka

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

Language
Scala
Licence
Other
Stars
13k
Latest
v2.10.23
Last push
2026-10-05
Apache Pekko

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

Language
Scala
Licence
Apache-2.0
Stars
1.6k
Latest
v1.7.1
Last push
2026-10-05

What these tools replace