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

Java Native Access

Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more

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

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

Simple OAuth library for Java

A reference implementation of a JSON package in Java.

The official AWS SDK for Java 1.x (In Maintenance Mode, End-of-Life on 12/31/2025). The AWS SDK for Java 2.x is available here: https://github.com/aws/aws-sdk-java-v2/

General data-binding package for Jackson: works on streaming API (core) implementation(s)

(DEPRECATED) Plugins for use with PhoneGap.

Fluent assertions for Java and Android

Simple Logging Facade for Java

Core part of Jackson that defines Streaming API as well as basic shared abstractions

Smiley's HTTP Proxy implemented as a Java servlet

Simple Java image-scaling library implementing Chris Campbell's incremental scaling algorithm as well as Java2D's "best-practices" image-scaling techniques.

Cassandra Java Client

Etherpad Open-Source Repository

Implementation of GeoHashes in java. We try to be/stay compliant to the spec, as far as possible.

Java library for the Stripe API.

Java Uuid Generator (JUG) is a Java library for generating all standard UUID versions (v1 - v7)

Solandra = Solr + Cassandra

Facebook's Realtime Distributed FS based on Apache Hadoop 0.20-append

Old v1 repo, please see http://github.org/telehash now.

Java Agent for Memory Measurements

a high level client for cassandra

web inspector remote - a debugger for remote/mobile web applications

Fling media to a ChromeCast device

Sitebricks: A fast platform for web development.

High performance non blocking web framework