Web based 3D Game engine
After finding "actionscripter" the flash based 3d game engine, I started looking for more of web based game engines.
I was most interested in Silverlight, and to my surprise I came across "Blader" a 3d game engine in silveright , which is available at codeplex( an open source community by Microsoft ) at http://www.codeplex.com/Balder/.
Yet I found one video on Mix Online http://visitmix.com/blogs/OpenSpace/A-Silverlight-Game-Engine/ . There that guy talked about another web based gaming tool called Unity3d. Unity3d seems to be a very good game development engine/ tool. It also had a web based player, installing which we could see the game in the web browser. They had the player installation for all OS. They seem to have a lot of stuff. I had not even thought of existence of such a superb tools for web based 3d games.
I've taken a screen shot from one of their demo at http://unity3d.com/gallery/live-demos/tropical-paradise. Its a 3d world in which I can walk through. Despite of being a web browser based 3d environment, it had all the components we could find in any desktop 3d environments, which is really great.

Today I found so many things that I did not even knew it existed. Even if I could use some of those stuff for myself, it would be a great achievement.