Best open-source Java projects

A CLI tool that extracts TLS/SSL certificates from servers and exports them as print output, PEM, DER, or p12/JKS truststores.

A stand-alone Java tool that exports Minecraft and Hytale worlds into USD (Universal Scene Description) for use in 3D animation and rendering pipelines.

Debloats Android TV and Google TV sets over Wi-Fi via ADB and replaces the ad-filled home screen with a clean, Apple TV-style launcher.

An MCP server that exposes Ghidra's reverse-engineering functions so LLM clients can decompile and analyze binaries.

A free, curated learning resource for Low Level Design and object-oriented design interview prep, covering OOP, design patterns, UML, and concurrency.

Self-hosted code quality and security platform that finds bugs, vulnerabilities and maintainability issues through static analysis.

Open-source Java application for load testing and measuring the performance of web applications and other services.

Open-source MPP real-time analytics and search database for SQL analytics, lakehouse queries, and hybrid JSON, full-text, and vector search.

Open-source desktop app for managing BibTeX and BibLaTeX bibliography libraries, collecting references and formatting citations.

Generates API client SDKs, server stubs, and documentation in many languages from an OpenAPI (v2/v3) specification.