Welcome to the home page of 'lv', the free viewer, checker, and adapter for STEP (ISO 10303) files 'lv' allows to: visualize 3D CAD files in the STEP or VDAFS formats visualize assembly structures easily locate individual instances in the STEP files check the geometrical accuracy, data quality, and structural integrity of CAD exchange files (both interactively and in batch mode) extract portions of a STEP file for further analysis fix quality problems in STEP files adapt STEP files to improve data exchange results between CAD systems 'lv' can be downloaded for free. It is available for UNIX platforms (AIX™, HP-UX™, IRIX™, Linux, and Solaris™).