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.
eAdventure (formerly <e-Adventure>) is an authoring tool for the creation of point-and-click games, especially designed for educational purposes. eAdventure is SCORM compatible so eAdventure games can be integrated with LMS like Moodle. More info at: http://e-adventure.e-ucm.es
Make games with Lego-like building blocks
OpenBlox lets you make games with a built-in physics engine, Lego-like building blocks, and a scripting language called Lua. Once you've made a game with OpenBlox, you can pack it into a single file with one mouse click, and share your game with anyone you want.
LGCK Builder provides a unique development environment that can be easily used by novice and seasoned game creators to get the best results quickly. Our approach is different because the philosophy is geared toward simplicity and re-usability. Quick 5 minute tutorial http://www.youtube.com/watch?v=lN3gkZWr-PM
A techonogically advanced engine using C++ and ASM as languages.
A techonogically advanced engine using C++ and ASM as languages, with improved performance and a almost virtually infinite triangle count support, even on slower and older machines. It haves a full shader system, physics system (DOE Based), 100% physically correct lightning and colour grading, and supports various popular formats in 3D modelling and gaming scene. It was previously under a heavy eula policy, but now is under GPL because of internal problems.
This is a personal project that I started after leaving my previous job, where I oversaw the development of an in-house 3D engine for online gaming. Epsilon refers to "almost nothing reused," and is designed around rapid throw-away prototyping.
A Silverlight framework that makes it easy to develop games and applications simulating creatures that interacts with eachother.
A game development studio and library for Windows, Linux, and Mac OSX. Uses Ogre 3D for rendering, but all components are designed to work with any technology.
YAams - Yet Another advanced maker system - YAams are an editor to create 2D Games without any programm knowledge. Its witten in Java & pluginable