Overture is a community-based project developing the next generation of open-source tools to support modelling and analysis in the design of computer-based systems. Overture supports VDM: The Vienna Development Method, a set of modelling techniques with a long and successful history of industrial application and research. Overture is an integrated development environment (IDE) for developing VDM models. The Overture tools are written entirely in Java and build on top of the Eclipse platform. Overture supports the VDM-SL, VDM++, and VDM-RT language dialects.