RPG Maker 2000/2003 and EasyRPG games interpreter
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Universal Unreal Engine VR Mod (4.8 - 5.4)
3D Engine with Blender Integration
Cross-Platform C++ 2D/3D game engine
Fast and lightweight JavaScript game engine built on WebGL and glTF
A game engine powered by python and panda3d
Cocos simplifies game creation and distribution with Cocos Creator
Dust3D is a cross-platform open-source 3D modeling software
Cross-platform 2D and 3D game engine with modular architecture
3D Procedural Game Engine Using OpenGL
A modular Common Lisp game engine
Pixel-Aligned 3D Generation from Images
3D game engine with lua scripting
Flax Engine, multi-platform 3D game engine
Blockbench - A low poly 3D model editor
Free game engine for development of desktop, mobile, and web games
3D game engine/framework in C, with Luajit and Python bindings now
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
LayaAir is an open-source 2D/3D engine
Voxel game engine in C++ with OpenGL
Map Pixel Art Generator for Minecraft
Java/JavaFX/Kotlin Game Library (Engine)
3D Game engine with editor
Open game and rendering engine packed into a JavaScript framework