OPEN CASCADE CAD Assistant is a viewer and converter for 3D CAD and mesh files, free for both personal and commercial use. CAD Assistant is based on open source libraries (Open CASCADE Technology, Qt, FreeType, FreeImage, etc.) and employs open formats for CAD and mesh data (STEP, IGES, BREP, DXF, SAT (ACIS), glTF, JT, PLY, STL, OBJ, 3DM).