SimLab OBJ Importer for SketchUp 2015 is a plugin developed by SimLab, a company that specializes in creating plugins and software for 3D modeling and simulation. The plugin allows users to import OBJ files, which are commonly used in 3D modeling and computer-aided design (CAD), into SketchUp. With this plugin, users can import OBJ files and use them in their SketchUp projects, enabling them to work with a wider range of 3D models.