CAD Assistant by OPEN CASCADE is a powerful offline viewer and converter for 3D CAD and mesh models. It provides basic CAD model viewing and converting capabilities, making it a valuable tool for professionals in the business and productivity category.

With CAD Assistant, you can view and navigate through CAD models using the tree browser to explore the assembly structure. You can hide or show components as needed to inspect the model, and query properties of selected sub-assemblies or parts.

The program supports various file formats, including BREP (native OCCT format), IGES, and STEP. This allows you to import and work with shape geometry, topology, assembly structure, colors, and more. You can also export CAD models to supported CAD or mesh formats.

In addition to CAD models, CAD Assistant also supports viewing mesh models with associated data. It supports popular mesh formats such as STL, PLY, OBJ, JT, and glTF. You can view the mesh in wireframe, shaded, or shrink view, and apply colors or scalar data to the elements. The interactive color scale allows you to manipulate the range of displayed quantities.

CAD Assistant is optimized for devices with multi-touch screens, providing intuitive manipulation of the 3D view through finger gestures. It also offers convenient features like fitting the model to the window, standard views, and access to viewer and application options.

Please note that opening large files may take time or be restricted due to device memory limits. However, files up to 50 Mb are generally safe to open on all devices.

If you're looking for a reliable offline 3D CAD viewer and converter, CAD Assistant is a great choice. It offers essential functionality and compatibility with various file formats, making it a valuable tool for professionals in the industry.