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Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Spring is a versatile 3D RTS game engine. Using extensively Lua for scripting game-specific code to make nearly every aspect of the engine customizable, from GUI, to unit AI, to pathfinding.
Zeta Engine Is a simple 2-Dimensional Data Driven ARPG Engine aimed to create ARPG Games by desribing Data from XML Files and adding behaviour with Lua language. You can create simple to Advanced features without even touching the engine's core code thought an extensive Lua API.
As for now, the gui System is CEGUI cause it can use the same data types as the Engine's.
Currently Third Party software supported:
Partial* Tiled Map support
Partial* Dark Function Editor Support
*By partial, means that the Engine uses only a part of the features provided by the software (For now).
The Engine provides the "Standard Zeta Lua Library" with useful pre-defined Lua scripts for easier game creation. ...
CorEngine is a work in progress, OpenGL graphics powered 3D game engine designed to help independent game developers with quick prototyping and game/virtual environment creation.
The engine supports a standard set of features, like skeletal animation, post processing, Lua/C programming, physics powered by Bullet Physics, GUI and 2D/3D Audio.
The next level of Warzone 2100. This fork expands on the retail release in a different direction than the resurrection project. New scripting engine, new file structure, and fully skinable GUI are but a few things that will be headed your way.