A high performance caching library for Java

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

The Clojure programming language

A collection of source code generators for Java.

1️⃣🐝🏎️ The One Billion Row Challenge -- A fun exploration of how quickly 1B rows from a text file can be aggregated with Java

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

A fast dependency injector for Android and Java.

Picocli is a modern framework for building powerful, user-friendly, GraalVM-enabled command line apps with ease. It supports colors, autocompletion, subcommands, and more. In 1 source file so apps …

LWJGL is a Java library that enables cross-platform access to popular native APIs useful in the development of graphics (OpenGL, Vulkan, bgfx), audio (OpenAL, Opus), parallel computing (OpenCL, CUD…

MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine.

🚄 FASTJSON2 is a Java JSON library with excellent performance.

Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface.

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

The Hypersistence Utils library (previously known as Hibernate Types) gives you Spring and Hibernate utilities that can help you get the most out of your data access layer.

An in-memory file system for Java

Enhancing Java Stream API

JLine is a Java library for handling console input.

Functional programming in Java

Java Abstracted Foreign Function Layer

Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful.

Jansi is a small java library that allows you to use ANSI escape sequences to format your console output which works even on windows.

A fast Java JSON schema validator that supports draft V4, V6, V7, V2019-09 and V2020-12

Lightning Memory Database (LMDB) for Java: a low latency, transactional, sorted, embedded, key-value store

Eclipse Xtext™ is a language development framework

LITIENGINE 🕹 The pure 2D java game engine.

A Java event based WebSocket and HTTP server

Jabel - unlock Javac 9+ syntax when targeting Java 8

Testing tools for javac and annotation processors

Java Runtime Compiler

Tools for working with generic types