The Cafu Engine is an all-purpose, modern 3D graphics engine and game development kit. It is feature complete to get you started quickly. It can be used to create a variety of 3D applications, including games, simulations, and training and architectural software. Written in C++, the tools, libraries, and framework have been designed to make the development of new games and other 3D applications easy. They are actively and continuously developed in order to provide the latest technology.
openDarkEngine is a from-scratch rewrite of the famous Dark Engine originally written by Looking Glass Studios. The engine was used in the Thief 1, Thief Gold, Thief 2, and System Shock 2 games. This rewrite is targeted at newer machines and should improve compatibility and give the games (and all the fan made material) a never ending life. It should also allow manipulation of the original data files.
AzureGE is a multi-platform OpenGL and OpenAL-based game engine. It has built-in support for I/O, threading, and networking, a particle system, a material generator, a texture generator, and a mesh/terrain generator. It is intended mainly for creating role playing games, but can also be used for other types of game.
TextureBuilder is a program to simplify the task of building several texture formats from six skybox images. The six different images represent the front, back, left, right, top, and bottom sides of a cube. They are combined to either a cross texture with the horizontal part up, a cross texture with the horizontal part down, a sideways cross texture, or a texture set including script files for the Torque 3D game engine.
The Brick Engine is a fast and simple lo-fi gaming engine. The engine provides a comprehensive API, including dazzling visual features, song playback, and collision detection: everything you need to make games with quickness and ease. The engine provides a straightforward C API and has language bindings for Tcl and Pascal, with support for more languages on the way.