Google core libraries for Java

Netty project - an event-driven asynchronous network application framework

IntelliJ IDEA & IntelliJ Platform

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

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

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

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

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

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

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

A fast ImageView that supports rounded corners, ovals, and circles.

Distributed Graph Database

The simple, stupid rules engine for Java

Open Source Web Crawler for Java

Apache Shiro

Source-agnostic distributed change data capture system

Teletraan is Pinterest's deploy system.

jmxtrans

Apache OpenNLP

Reactive Extension (Rx) Adaptor for Netty

Netflix's distributed Data Pipeline

The premier open source Data Quality solution

Using Gradle to build Python projects

Hadoop library for large-scale data processing, now an Apache Incubator project

Adds support for Guice to Dropwizard

GUI library for Ruby/Clojure/Java

A JRuby version of the "pg" gem.

A whole bunch of functions, filters, and other tools that make writing Cascading flows a joy