Implementation and explanation of the most common design patterns.

No-nonsense implementation of FizzBuzz made by serious businessmen for serious business purposes. (No explicit license)

Popular Java 8 guide.

Java-to-Objective-C translator for porting Android libraries to iOS.

Browser extension which allows to navigate through code on GitHub more efficiently.

Library for the Svix API to send webhooks and verify signatures.

In-memory file system.

Wrapper around AWS' API.

High performance HTTP proxy atop Netty's event-based networking library.

Ultra-fast, SQL-like queries on Java collections.

Analogue of Gradle Wrapper for Maven, allows building projects without installing maven.

Source transpiler to TypeScript/JavaScript.

Feature Flags for Java.

Mailing with a clean and fluent API.

Framework for building chatbots. (GPL-3.0-only)

Extensions for Maven 3.3.1+ that allows writing the POM model in dialects other than XML.

Tools for resolving generic types.

Simple wrapper for the org.w3c.dom package, to allow for fluent XML document creation and manipulation with an API inspired by jQuery.

Open-source, reverse-proxy framework.

Small utility library for using handlers and commands with pipelines.

Framework for fragment-based message processing. (Apache-2.0 OR LGPL-3.0-or-later)

Obfuscation via renaming and shrinking.

Detect uses of legacy Java APIs.

Lightweight, small and customizable FTP server.

Processes XML by using annotations or XPath within code.

RR4J is a tool that records java bytecode execution and later allows developers to replay locally.

Wrapper for the IP2Location.io Geolocation API and the IP2WHOIS domain WHOIS API.

A small library that contains a representation object of ISBN-10 and ISBN-13 and tools to parse, validate and format one.