ug nx viewer free

From: http://viewer.kisters.de/en/downloads.html

  3D-Viewer, 3D-CAD-Viewer and 2D-Viewer provided by KISTERS for efficient visualization
  

From: https://shop.oracle.com/pls/ostore/product?p1=AutoVue&p2=&p3=&p4=

  Oracle AutoVue - AutoVue Enterprise Visualization is a suite of Oracle solutions designed to view,
  digitally annotate and collaborate on a variety of engineering, CAD and business documents without 
  requiring investment in specialized CAD or authoring tools. Customers can choose from amongst five 
  AutoVue solutions, each designed to suit an organization’s current and evolving document visualization
  requirements.
  

From: http://kubotek3d.com/Products/Spectrum-Viewer.aspx

  Kubotek Spectrum is low cost, professional-grade CAD viewer software for reviewing 3D models and drawings.