Google core libraries for Java

Termux - a terminal emulator application for Android OS extendible by variety of packages.

A Java serialization/deserialization library to convert Java Objects into JSON and back

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

The ZAP by Checkmarx Core project

Interview questions

The Clojure programming language

A collection of source code generators for Java.

A JavaScript checker and optimizer.

Source code for the Processing Core and Development Environment (PDE)

A High Dynamic Range (HDR) Histogram

Google HTTP Client Library for Java

A Property Graph Model Interface (no longer active - see Apache TinkerPop)

A Java performance monitoring library, exposing and collecting metrics through a variety of outputs