cadprops.com
CADProps

CADProps
Multi-Format CAD Viewer & Online Measurement Tools | CADProps
Quickly view and measure SolidWorks, NX, Inventor, CATIA, Parasolid X_T, SAT, JT solids, STEP, IGES and mesh formats online. Convert files and share 3D models by link with an optional password. Mesh measurements are approximate.
Free in-browser CAD viewer: open STEP, STL, IGES, SolidWorks files and measure volume and weight.