For current stable release check the documentation page.
Snapshots of the latest development version of Akka docs are available
Documentation: Reference Java API Scala API
Akka 2.8
Akka 2.8 was the previous stable version, released on March 16, 2023. Only patched if critical bugs are found.
Documentation: Reference Java API Scala API
Artifacts are available from Maven Central.
Akka 2.7 was the previous stable version, released on October 19, 2022. Only patched if critical bugs are found.
Documentation: Reference Java API Scala API
Artifacts are available from Maven Central.
Akka 2.6 reached end-of-life October 19, 2023, with the last version being 2.6.21
Documentation: Java Manual Java API Scala Manual Scala API
Artifacts are available from Maven Central.
Akka 2.5 reached end-of-life 11/6/2020, with the last version being 2.5.32
Documentation: Java Manual Java API Scala Manual Scala API
Artifacts are available from Maven Central.
Akka 2.4 reached end-of-life 12/31/2017, with the last version being 2.4.20
Documentation: Java Manual Java API Scala Manual Scala API
Artifacts are available from Maven Central.
Akka 2.3 reached end-of-life April, 2017 with the last version being 2.3.16.
Documentation: Java Manual Java API Scala Manual Scala API
Artifacts are available from Maven Central.
Even older release are available from Maven Central for their respective version number.