An OBJ viewer is a valuable tool for anyone working with 3D models, as it allows for the visualization and manipulation of OBJ files, a popular file format for 3D modeling. This software provides a user-friendly interface for viewing, rotating, and zooming in on 3D objects, making it easier to inspect and analyze models from different angles. With an OBJ viewer, users can also apply materials and textures to 3D models, allowing for a more realistic representation of the final product. Additionally, an OBJ viewer often supports cross-platform compatibility, enabling users to access and view 3D models on various devices and operating systems. Overall, utilizing an OBJ viewer streamlines the 3D modeling process and enhances the ability to visualize and present 3D models effectively.