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GemRB (Game engine made with preRendered Background) is a portable open-source implementation of Bioware's Infinity Engine which was written to support pseudo-3D role playing games based on the Dungeons & Dragons ruleset (Baldur's Gate, Icewind Dale, Planescape: Torment).
vgSDK, a shortcut for Versatile Graphical Software Development Kit, consists of a set of cross-platform C++ libraries which provides a complete framework for doing graphical related tasks.
A portable C++-based game engine designed to simplify and speed 2D accelerated games. Still very much under construction. Currently uses your choice of Allegro, Irrlicht or SDL/OpenGL.
Platinum Arts Sandbox Free 3D Game Maker is an open source game design program for kids and adults. The focus is to make the process of creating games and worlds easy enough for kids but powerful enough to create full game projects. Sandbox is already being used in many schools and colleges ... [More]
The ZX Game Engine is a cross platform(Win32, Linux, and planned OS X) hardware accelerated 2D game engine to allow for extremely easy programming, while still allowing some low level access.
Entropia Engine++ is a 2D Game Engine designed for an easy cross-platform game development. The project aims to provide a simple and powerfull framework that takes advantage of C++, OpenGL, OpenAL and SDL.
Galactic Engine 2 or GE2 http://sourceforge.net/projects/ge2/ Is a new 3D engine currently actively in development.
Mokoi Gaming is a Open Game Platform, with easy to use creation tools. Mokoi is being designed to work on any OS, Console or Handheld device. We're also have projects to help with creating and sharing platform neutral games.
Open RPG Maker is a free and open source clone of features from the RPG Maker series (i.e. rpgmaker200, rpgmaker2003, rpgmakerxp), as well as many other features. All of the data files are in XML format and are easily editable with any text editor.