We have a couple of licenses for the NX Viewer. It works well for users that only need to review existing models or drawings. No import/export of models just open the file and review what you need. You can measure, use the edit section, review drawings etc..
No it is not free but you get what you pay for.
John Joyce
N.C. Programming Supervisor
Barnes Aerospace, Windsor CT
NX6, NX7.5,NX8.5, NX9.0
Vericut7.3