Ghidra is a software reverse engineering (SRE) framework

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

Free universal database tool and SQL client

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

A libre lightweight streaming front-end for Android.

Netty project - an event-driven asynchronous network application framework

a fast, scalable, multi-language and extensible build system

Desktop/Android/HTML5/iOS Java game development framework

FizzBuzz Enterprise Edition is a no-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes.

JDK main-line development https://openjdk.org/projects/jdk

GraalVM compiles applications into native executables that start instantly, scale fast, and use fewer compute resources 🚀

IntelliJ IDEA & IntelliJ Platform

A fast dependency injector for Android and Java.

Modular and customizable Material Design UI components for Android

QuestDB is a high performance, open-source, time-series database

Graphs for Everyone

Style and Grammar Checker for 25+ Languages

The Clojure programming language

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

Open-Source Subscription Billing & Payments Platform

RStudio is an integrated development environment (IDE) for R

Terasology - open source voxel world

Database Subsetting and Relational Data Browsing Tool.

An extremely easy way to perform background processing in Java. Backed by persistent storage. Open and free for commercial use.

Java bindings for Skia

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

OpenMRS API and web application code

RARS -- RISC-V Assembler and Runtime Simulator

A fast and secure browser for standalone virtual-reality and augmented-reality headsets.

Erlang IDE