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Concurrency Libraries
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1. Kotlinx Coroutines Core10,558 usages

org.jetbrains.kotlinx » kotlinx-coroutines-coreApache

Coroutines support libraries for Kotlin
Last Release on Apr 8, 2025

2. Kotlinx Coroutines Android4,641 usages

org.jetbrains.kotlinx » kotlinx-coroutines-androidApache

Coroutines support libraries for Kotlin
Last Release on Apr 8, 2025

3. Awaitility4,095 usages

org.awaitility » awaitilityApache

A Java DSL for synchronizing asynchronous operations
Last Release on Feb 21, 2025

4. RxJava4,086 usages

io.reactivex.rxjava2 » rxjavaApache

Reactive Extensions for Java
Last Release on Feb 13, 2021

Relocated → io.reactivex.rxjava3 » rxjava

5. AtomicFU2,509 usages

org.jetbrains.kotlinx » atomicfuApache

The idiomatic way to use atomic operations in Kotlin.
Last Release on Jun 26, 2025

6. RxJava2,207 usages

io.reactivex » rxjavaApache

rxjava
Last Release on Mar 31, 2018

Relocated → io.reactivex.rxjava2 » rxjava

7. Non Blocking Reactive Foundation For The JVM2,141 usages

io.projectreactor » reactor-coreApache

Non-Blocking Reactive Foundation for the JVM
Last Release on Nov 7, 2025

8. Vert.x Core1,732 usages

io.vertx » vertx-coreApacheEPL

The Vert.x core APIs contain the backbone for writing Vert.x applications and low-level support for HTTP, TCP, UDP, file system, asynchronous streams and many other building blocks.
Last Release on Oct 22, 2025

9. Disruptor Framework1,454 usages

com.lmax » disruptorApache

Disruptor - Concurrent Programming Framework
Last Release on Sep 29, 2023

10. RxJava1,037 usages

io.reactivex.rxjava3 » rxjavaApache

Reactive Extensions for Java
Last Release on Sep 24, 2025