Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Kotlin extensions for the libGDX game framework
Cross-platform 2D and 3D game engine with modular architecture
Cocos simplifies game creation and distribution with Cocos Creator
An OpenGL RTS game engine written in C
Open source library for creative expression on the web, desktop, etc.
Zig game engine & graphics toolkit
PyCAPGE - Python Classic Adventure Point and Click Game Engine
MIT Licensed Open Source version of Torque3D from GarageGames
3D C++ Game Engine - yet another open source game engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games