The application of virtual worlds through Internet for teaching allows that the student can submerge himself in friendly environments that make learning more pleasant. This article presents three educational applications developed in these worlds. The first, for virtual museum of history and culture, shows a set of virtual worlds are designed, and where the student interacts with different objects. When an object is selected, its name can be show and the student can listen to its history. In the following application, a virtual classroom, the created world can be shared simultaneously by several users. One such move is the incorporation of 3D virtual worlds in the learning environment. Another is the increasing development of multiagent systems that support the learner or the tutor. This is based on multiagent systems with 3D virtual worlds could provide a more engaging immersive learning environment. This analysis explores the feasibility of integrating a 3D virtual world with a pedagogical multiagent system named QuizMASter, an educational game for elearning that helps students learn their course material through friendly competition. The integration was developed by devising, implementing and testing an approach using open source technologies, namely, Open Wonderland and JADE. There are diverse materials available as in the traditional classrooms, for example a blackboard, laser pointer and a slide projector. Finally, the latest advances in the creation of virtual environments have been applied in the third application using a game server. This has made possible the design of a more realistic world where the student can interact with other users and share his experiences.

3D,Multi-user Virtual Classroom, Virtual Museu, 3D Video Chat Room