OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Desktop/Android/HTML5/iOS Java game development framework

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

Open Location Code is a library to generate short codes, called "plus codes", that can be used as digital addresses where street addresses don't exist.

DNS-based Host Blocker (and lightweight ad blocker) for Android

A fast, customizable and compatible open source server for Minecraft: Java Edition

A simple yet powerful resizer for Android Image resources

A client- and server-side templating system that helps you dynamically build reusable HTML and UI elements

WorldPainter is an interactive graphical map generator for the indie game Minecraft.

Andor's Trail

A headless spreadsheet document container service.

simple games that can be played by calling web services

Spring Boot2 + ReactJS project with all important bits already setup.