Web powered cross-platform 3D, WebXR game engine
Cerberus Content Management System
Children's learning programming language Karel the Robot in 3D
Duke Nukem 3D Map Viewer
C/C++ , PHP, PYTHON, 3D ENGINES, CHROME NATIVE CLIENT
Open-Source, 3D Printed, Light, Tabletop Strategy War Game
The Atomic Game Engine is a multi-platform 2D and 3D engine
Realtime 3D engine for game development
Bot for id Software's Wolfenstein 3D
online 4X browser game engine
Open-source, cross-platform, C++ game engine for creating 2D/3D games
A public domain cross platform 3D game
3D .NET engine for Windows, Linux, Mac
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
plugin-based RPG manager in C++ and Qt5
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
Open Game Bootstrap