Old-school 2D game engine
Vivid3D is an open-source 3D engine with powerful 2D UI.
Cinema Enters Game Console
Modern 3D engine and IDE written using C# and C++.
Portable game engine with main focus on point-and-click adventures
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
An Adventure Game Engine
A generic framework for chess games
A game engine written in the D programming language
An advanced flexible game engine for Java.
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Multimedia asset management and manipulator for Étoilé
A generic 2D engine for any kind of game
Take the chess graphism, and use it with a chess engine.
Multi-threaded 2D Renderer licensed under the Mozilla Public License
Library for creating turn-based games with simultaneous moves.
TurboSphere is an easy to learn and powerful JS based game engine.
A 3D, fully concurrent game engine
A cross-platform game framework based on OpenGL and GObject.
2D Game Engine, based on OpenGL and focused on Isometric Games
A lightweight HTML5 Game Engine