jOOQ is the best way to write SQL in Java
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Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.
Shattered Pixel Dungeon is an open-source traditional roguelike dungeon crawler with randomized levels and enemies, and hundreds of items to collect and use. It's based on the source code of Pixel Dungeon, by Watabou.
Gephi - The Open Graph Viz Platform
Hazelcast is a unified real-time data platform combining stream processing with a fast data store, allowing customers to act instantly on data-in-motion for real-time insights.
Java binary serialization and cloning: fast, efficient, automatic
Material design file manager for Android
Asynchronous, non-blocking HTTP & WebSocket client for the JVM
Apache Camel is an open source integration framework with 350+ connectors. Write routes in Java, YAML, or XML. Run on Spring Boot, Quarkus, or standalone. Apache License 2.0.
Generate Java types from JSON or JSON Schema and annotate those types for data-binding with Jackson, Gson, etc
Apache KIE (Knowledge Is Everything) is the home of Drools, OptaPlanner, jBPM, and Kogito.
Apache NiFi
GraphQL Java implementation
Reformats Java source code to comply with Google Java Style.
Java 1-25 Parser and Abstract Syntax Tree for Java with advanced analysis functionalities.
📌 异步线程池框架，支持线程池动态变更&监控&报警，无需修改代码轻松引入。Asynchronous thread pool framework, support Thread Pool Dynamic Change & monitoring & Alarm, no need to modify the code easily introduced.
Production-safe dynamic tracing and diagnostics for Java applications—attach to live JVMs with no restart or recompilation.
JSqlParser parses an SQL statement and translate it into a hierarchy of Java classes. The generated hierarchy can be navigated using the Visitor Pattern
A Material design back port of Android's CalendarView
An Open-Source Collection of Flash Cards to Help You Preparing Your Algorithms & Data Structures and System Design Interviews 💯
Main Liquibase Source
An extensible multilanguage static code analyzer.
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, CUDA) and XR (OpenVR, LibOVR, OpenXR) applications.
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 can include as source & avoid adding a dependency. Written in Java, usable from Groovy, Kotlin, Scala, etc.