  VFIVE is a scientific visualization application for CAVE-type immersive
virtual reality systems. The source codes are freely available. VFIVE is used
as a research tool in various VR systems. It also lays the groundwork for
developments of new visualization software for CAVEs. In this paper, we pick up
five CAVE systems in four different institutions in Japan. Applications of
VFIVE in each CAVE system are summarized. Special emphases will be placed on
scientific and technical achievements made possible by VFIVE.
