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Free and Open Source, Distributed, RESTful Search Engine
Conductor is an event driven agentic workflow engine providing durable and highly resilient execution engine for applications and AI Agents
Orchestrate everything, everywhere. The open-source control plane for workflows across data, infrastructure, business processes and AI agents. Declarative YAML, event-driven, any language, Git-versioned, scalable to millions of executions.
Desktop/Android/HTML5/iOS Java game development framework
The official home of the Presto distributed SQL query engine for big data
A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)
🔎 Open source distributed and RESTful search engine.
Official repository of Trino, the distributed SQL query engine for big data, formerly known as PrestoSQL (https://trino.io)
Agentic AI Framework for Java Developers
Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. It's open-source and distributed under the Apache license. Activiti runs in any Java application, on a server, on a cluster or in the cloud. It integrates perfectly with Spring, it is extremely lightweight and based on simple concepts.
A compact and highly efficient workflow and Business Process Management (BPM) platform for developers, system admins and business users.
The modern Java bytecode editor
Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.
Apache KIE (Knowledge Is Everything) is the home of Drools, OptaPlanner, jBPM, and Kogito.
Android virtual machine and deobfuscator
Roadmap to becoming a Java developer in 2026
Decompiler from Java bytecode to Java, used in IntelliJ IDEA.
A complete 3-D game development suite written in Java.
Agentic Orchestration Platform
Java bytecode engineering toolkit
Terasology - open source voxel world
🗺️ Minecraft map editor and mod
Manifold is a Java compiler plugin, its features include Metaprogramming, Properties, Extension Methods, Operator Overloading, Templates, a Preprocessor, and more.