You can make it - Open Source MMORPG Platform
Fast and lightweight JavaScript game engine built on WebGL and glTF
Gideros Release version
Game/Scene Development System
A free 3D game engine to create games and realtimes scenes for Windows
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
A cross platform Lua based game engine
A 2D game engine and level editor
A real-time game development platform
Javascript Canvas Framework
Open-source, cross-platform, C++ game engine for creating 2D/3D games
3D .NET engine for Windows, Linux, Mac
2D game engine for traditional platform games
.NET - VISUAL BASIC NVIDIA +ATI PHYSX SLIMDX DIRECTX 9 -ENGINE/WRAPPER
Open Game Bootstrap
Mahasona engine is an open source game engine.
Educational framework for OpenGLES, OpenCL and OpenAL
A generic 2D engine for any kind of game
3D Interactive sandbox environment