Glovius for Windows
Glovius is an extensible & customizable 3D viewer, for consumption of product design data. Glovius for Windows is a free JT Viewer with an add-on architecture, based on the industry standard JT file format. Using Glovius, view and interact with your JT files.
You can also export models to the mobile optimized format to visualize on the iPad/iPhone, using Glovius for iPhone/iPad. Download add-ons to add more input formats and to extend the functionality of the free viewer.