📌 a missing Java std lib(simple & 0-dependency) for framework/middleware, provide an enhanced InheritableThreadLocal that transmits values between threads even using thread pooling components.

Asynchronous Http and WebSocket Client library for Java

Advanced Java Redis client for thread-safe sync, async, and reactive usage. Supports Cluster, Sentinel, Pipelining, and codecs.

MySQL Proxy using Java NIO based on Sharding SQL,Calcite ,simple and fast

Java Deferred/Promise library similar to JQuery.

EA Async implements async-await methods in the JVM.

Powerful event-bus optimized for high throughput in multi-threaded applications. Features: Sync and Async event publication, weak/strong references, event filtering, annotation driven

High performance reactive SQL Client written in Java

ActiveJ is an alternative Java platform built from the ground up. ActiveJ redefines core, web and high-load programming in Java, providing simplicity, maximum performance and scalability

Android library to easily serialize and cache your objects to disk using key/value pairs.

Vert.x 3 guide for Java developers

Asynchronous retrying for Java 7/8

A jOOQ-CodeGenerator to create vertx-ified DAOs and POJOs.

Modular Async/Sync/Reactive Twitch API Client / IRC Client

A Tiny Task Library

Client-side response routing for Spring

Asynchronous PostgreSQL Java driver

Standalone Play WS, an async HTTP client with fluent API

TaskChain Control Flow framework. Helps facilitate running tasks on an application's "Main Thread" (such as a game), and tasks off the main (async).

Implementation of blocking (IO-Bound) cancellable java.util.concurrent.CompletionStage and related extensions to java.util.concurrent.ExecutorService-s