Open source. Open possibilities.

Apache Flink is an open-source stream processing framework providing powerful capabilities for both data streaming and batch processing.

Appsmith is an open-source low-code platform for building admin panels, internal tools and dashboards. It connects to 25+ databases and any API, and can be self-hosted via Docker, Kubernetes or AWS AMI.

OpenSearch is an open-source, enterprise-grade distributed search and observability suite designed to manage unstructured data at scale.

Proof-of-concept tool that generates serialized Java payloads exploiting unsafe object deserialization, bundling 30+ gadget chains for libraries such as Commons Collections, Spring, Groovy and Hibernate, intended for security research and authorized testing.

Apache Beam is a unified programming model for defining both batch and streaming data-parallel processing pipelines.

LibGDX endless runner project 'Dino Run', developed during a FliSoL 2017 workshop. Includes core, desktop, and Android modules. Completed and no longer maintained.

Gatling is an open‑source load‑testing platform that lets you write performance tests as code in Java, JavaScript/TypeScript, Kotlin or Scala. It uses a non‑blocking, asynchronous engine for high scalability, supports HTTP, WebSocket, SSE, JMS, gRPC and MQTT, and integrates with CI/CD pipelines, APM tools and observability platforms.

Sa-Token is an open-source Java authentication framework offering login, permission validation, distributed sessions, gateway auth, SSO, OAuth2.0, JWT, API Key signing, with out-of-the-box support for SpringBoot and Solon.

Mindustry is an open-source tower-defense real-time strategy game with heavy automation and factory-building elements, written in Java. It targets desktop, Android and dedicated server builds, and ships with modding support, a public wiki, Javadoc and an active suggestion tracker.

A Super Mario Bros clone developed in Java using the LibGDX framework for study purposes.

Code随想录 (LeetCode-Master) is a structured LeetCode study plan covering data structures and algorithms, with 200+ curated problems, detailed图文 solutions, and video lectures, supporting C++、Java、Python and other languages.

libGDX is a cross-platform Java game development framework based on OpenGL (ES) for Windows, Linux, macOS, Android, web browsers and iOS. It supports 2D and 3D games, uses Gradle for setup, is Apache 2.0 licensed, and has a large third-party ecosystem.

A free single-player MTG adventure game built on Forge, featuring five rival colors battling over a living map with dynamic territory, reputation systems, and real card duels.

Official Docker images for Eclipse GlassFish, a Java EE application server. Provides versioned Dockerfiles with GlassFish 7 recommended for containerized deployment.

Shatterfish is an open-source engine for Shattered Pixel Dungeon, inspired by Stockfish. It enables headless gameplay, symbolic AI bots, statistical testing, and in-game overlays — all while enforcing fair information parity with human players.

Kyrixen Studio is a lightweight, open-source IDE specifically designed for LibGDX development.

Java bindings for Box2D physics engine, supporting desktop, Android, and web via JNI, FFM, TeaVM, and WebAssembly. Includes libGDX and libfdx integrations with cross-platform samples.

Retrofit is a type-safe HTTP client for Android and the JVM, letting developers define REST API calls as annotated Java interfaces. It requires Java 8+ or Android API 21+ and ships R8/ProGuard rules.

Guava is Google's set of core Java libraries, offering new collection types, immutable collections, a graph library, and utilities for concurrency, I/O, hashing, primitives, and strings. It ships in JRE and Android flavors and is widely used across Java projects.

Stirling PDF is an open-source PDF platform for editing, signing, converting, and automating PDFs locally or on your own servers—no external services required.