MultiTracer is a Java application that allows images to be displayed in three dimensions. The tool allows anatomic structures to be traced and the tracings to be saved in a format that facilitates review and revision. The traced structures can also be exported in the UCF format that is used by many of the tools in the UCLA Laboratory of Neuroimaging. These include tools for simple measurements (e.g., areas, volumes, lengths, width, surface areas, etc.) as well as tools that resample the tracings into surface meshes that can be analyzed and displayed.