3D game engine/framework in C, with Luajit and Python bindings now
Extremely fast enterprise server framework, can be used in RPC
Native Android app for Habitica
the java game and entertainment runtime
Arianne is an engine to develop multiplayer online games like Stendhal
Sceneform Maintained is an ARCore Android SDK with Google Filament
A Rust framework for building Minecraft servers
Build Cross-platform Applications
3D .NET engine for Windows, Linux, Mac
A panographic toolkit compliant with open source standards
Geospatial Web 3D Globe Project(To consider S.Korea market)
An IRC bot project case study.