An experimental technology by Sun Microsystems Laboratories and the open-source community.

Project Wonderland is a Java, free and open-source toolkit for building 3D interactive virtual worlds.
The aim of this multi-user virtual environment is to provide an environment that organizations can rely on it as a place to conduct business.

People should be able to do their real work within this space, eliminating the need for a separate collaboration tool when they wish to work together with others.

One Wonderland's feature is the fact that is completely extensible. Developers and graphic artists can extend the functionality to create new worlds and new features in existing worlds.