Free and Open Source, Distributed, RESTful Search Engine

Netty project - an event-driven asynchronous network application framework

Apache Flink

Desktop/Android/HTML5/iOS Java game development framework

Jenkins automation server

The official home of the Presto distributed SQL query engine for big data

Apache Hadoop

Suite of tools for deploying and training deep learning models using the JVM. Highlights include model import for keras, tensorflow, and onnx/pytorch, a modular and tiny c++ library for running mat…

Apache Druid: a high performance real-time analytics database.

Apache Cassandra®

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Alluxio, data orchestration for analytics and machine learning in the cloud

Web-based notebook that enables data-driven, interactive data analytics and collaborative documents with SQL, Scala and more.

Drools is a rule engine, DMN engine and complex event processing (CEP) engine for Java.

Distributed Graph Database

Fork of tagtraum industries' GCViewer. Tagtraum stopped development in 2008, I aim to improve support for Sun's / Oracle's java 1.6+ garbage collector logs (including G1 collector)

Azkaban workflow manager.

H2 is an embeddable RDBMS written in Java.

Apache Nutch is an extensible and scalable web crawler

Apache Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log-like data

Rest.li is a REST+JSON framework for building robust, scalable service architectures using dynamic discovery and simple asynchronous APIs.

Twitter common libraries for python and the JVM (deprecated)

Apache TinkerPop - a graph computing framework

A Graph Traversal Language (no longer active - see Apache TinkerPop)

Apache Jena, A free and open source Java framework for building Semantic Web and Linked Data applications.

Apache Accumulo

LocationTech Spatial4j: A Geospatial Library for Java

WE HAVE MOVED to Apache Incubator. https://cwiki.apache.org/FLUME/ . Flume is a distributed, reliable, and available service for efficiently collecting, aggregating, and moving large amounts of log…

Minimalist Java framework for rapidly creating scalable, containerless, RESTful microservices. Ship a production-quality, headless, RESTful API in the shortest time possible. Uses Netty for HTTP, J…

Method stubs and test cases for the problems from Elements of Programming Interviews