Crystal Space is a free cross-platform software development kit for realtime 3D graphics, in particular games.
DimensioneX is what people would call a Multiplayer Game Engine. It lets you develop a game without having to re-inventing the wheel. Here’s what DimensioneX does for you:
-Display of the game scene, play sounds.
-Positioning and behaviour of the players in the game
-Communication via network between the players
-Management of saved games
-The users will play your games simply via their browser.
This game engine is actually a Java Servlet. It is not for a specific platform (i.e. PC or Mac) it will run on any Java-enabled web server (such as: Tomcat, also freeware).
If you need tools, sdk to make your games or apps you may wanna check our gamemaker section, hopefully yoy’ll find something useful.. see ya.