Google core libraries for Java

A fast dependency injector for Android and Java.

Quarkus: Supersonic Subatomic Java.

Git Server with CI/CD, Kanban, and Packages. Seamless integration. Unparalleled experience.

A Java API for generating .java source files.

Java JWT: JSON Web Token for Java and Android

A collection of source code generators for Java.

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

Java Native Access

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

Asynchronous Http and WebSocket Client library for Java

configuration library for JVM languages using HOCON files

Hibernate's core Object/Relational Mapping functionality

vʌvr (formerly called Javaslang) is a non-commercial, non-profit object-functional library that runs with Java 8+. It aims to reduce the lines of code and increase code quality.

Java 1-21 Parser and Abstract Syntax Tree for Java with advanced analysis functionalities.

Open source version of Google Authenticator (except the Android app)

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 …

Your entire server infrastructure at your fingertips

H2 is an embeddable RDBMS written in Java.

Jodd! Lightweight. Java. Zero dependencies. Use what you like.

OpenPDF is a free Java library for creating and editing PDF files, with a LGPL and MPL open source license. OpenPDF is based on a fork of iText. We welcome contributions from other developers. Plea…

Terasology - open source voxel world

Java dataframe and visualization library

FlatLaf - Swing Look and Feel (with Darcula/IntelliJ themes support)

Java libraries for writing microservices

Java library for parsing and rendering CommonMark (Markdown)

Core part of Jackson that defines Streaming API as well as basic shared abstractions

The Jdbi library provides convenient, idiomatic access to relational databases in Java and other JVM technologies such as Kotlin, Clojure or Scala.

Asciidoc Editor and Toolchain written with JavaFX 21 (Build PDF, Epub, Mobi and HTML books, documents and slides)

Official FBReaderJ project repository