LiteBox3D is an easy to use JT viewer which also supports PLMXML, STEP AP242 XML

LiteBox3D is an easy to use JT viewer which also supports PLMXML, STEP AP242 XML and TIFF files.
This free of charge Desktop Viewer can be extended with add-on applications for IP protection, model comparison and quality validation.
LiteBox3D is characterized by its user-friendliness. LiteBox3D is self-explanatory regarding its functions, users do not need any previous CAD knowledge for measuring, clipping and comparing assemblies.
By directly accessing the JT model based on the ISO description as well as the 64 Bit support, LiteBox3D is able to view large CAD models in the JT format. Furthermore, the function of multithreading ensures the fast loading of files.
The free version of LiteBox3D Desktop viewer may be used unlimited for commercial usage.
LiteBox3D Pro extends the capabilities of the free viewer with redlining, PMIs, 3DHTML export, etc.