RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.

High Performance Inter-Thread Messaging Library

Zipkin is a distributed tracing system

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

Logstash - transport and process your logs, events, or other data

Tink is a multi-language, cross-platform, open source library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 11 and above, brought to you by Google.

A collection of source code generators for Java.

A simple expressive web framework for java. Spark has a kotlin DSL https://github.com/perwendel/spark-kotlin

A fast build system that encourages the creation of small, reusable modules over a variety of platforms and languages.

A damn simple library for building production-ready RESTful web services.

📈 Capturing JVM- and application-level metrics. So you know what's going on.

A fast dependency injector for Android and Java.

Backport of Java 8's lambda expressions to Java 7, 6 and 5

A lightning fast, transactional, file-based FIFO for Android and Java.

Simple, high-performance event-driven HTTP client+server for Clojure

An in-memory file system for Java 7+

A High Dynamic Range (HDR) Histogram

The Jdbi library provides convenient, idiomatic access to relational databases in Java and other JVM technologies such as Kotlin, Clojure or Scala.

Reactive Extension (Rx) Adaptor for Netty

Read Eval Print Loop for Java

Java Abstracted Foreign Function Layer

Java Indexed Record Chronicle

Vim-like editing in Eclipse

A Java event based WebSocket and HTTP server

JMX on Capsaicin

Testing tools for javac and annotation processors

Shazam in Java

an easy to use webdav client for java

Read-only mirror of ASF Git Repo for jclouds