scriptable gameengine with built-in support for 2D graphics and sound
Geeny is a scriptable gameengine with built-in support for 2D graphics and sound. The scripting language is object oriented, high performance is attainable by using vector and array operations. Win32 C++, full portability planned in the future.
SAGE stands for Simple Asynchronous GameEngine and is an attempt to implement a multithreaded gameengine in C#. For rendering/physics/sound/etc it uses(/will use) open source libraries (like OGRE, ODE, etc) through plugins.
The 'Nameless Allegro Engine' is a several layers of C++ abstraction. It is intended to abstract the entire game development process all the way from Allegro to the finished game.
GAEM stands for Graphical Adventure tiny-Engine for Mobiles. Its main use is to read some text files and images and generate the game. It's being developed in J2ME under CLDC/MIDP environment.