Android virtual machine and deobfuscator
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A blazingly fast multi-language serialization framework for idiomatic domain objects, schema IDL, and cross-language data exchange.
Roadmap to becoming a Java developer in 2026
Official GeoServer repository
Decompiler from Java bytecode to Java, used in IntelliJ IDEA.
OpenPDF is an open-source Java library for creating, editing, rendering, and encrypting PDF documents, as well as generating PDFs from HTML. It is licensed under the LGPL and MPL.
A complete 3-D game development suite written in Java.
Agentic Orchestration Platform
Fault tolerance and resilience patterns for the JVM
Alibaba Dragonwell8 JDK
Java bytecode engineering toolkit
The official AWS SDK for Java 1.x (In Maintenance Mode, End-of-Life on 12/31/2025). The AWS SDK for Java 2.x is available here: https://github.com/aws/aws-sdk-java-v2/
PowerMock is a Java framework that allows you to unit test code normally regarded as untestable.
A tool to help eliminate NullPointerExceptions (NPEs) in your Java code with low build-time overhead
Awaitility is a small Java DSL for synchronizing asynchronous operations
Phoenix Pull-to-Refresh
A better compressed bitset in Java: used by Apache Spark, Netflix Atlas, Apache Pinot, Tablesaw, and many others
Terasology - open source voxel world
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Micro second messaging that stores everything to disk
Java dataframe and visualization library
The official Java SDK for Model Context Protocol servers and clients. Maintained in collaboration with Spring AI
Library for OpenAPI 3 with spring-boot
Java client for Kubernetes & OpenShift