OFFSHORE PLATFORM 5 with Piping and Equipment (p3d.in viewer)

P3D.in is an online service for importing, viewing and sharing your 3D models. Although you can opt in for a paid account with extended features, this tool is completely free to use.

Features include: support for Wavefront Obj. files, unique sharing URL generation for uploaded models, privacy options for viewing, navigation settings, model manipulation functions, viewing control options, embeddable HTML code, and 50 MB of storage space when you sign up. Visit their FAQ page for full details.