Free online service which can display your uploaded 3D files within your browser with WebGL, interactive and embeddable:
Sketchfab is a web service to publish interactive 3D content online in real-time without plugin. The world we live in is in 3D, but the web is still in 2D, and we want to change that. We think your 3D models deserve something better than screenshots or “showreel” videos. That’s why we created Sketchfab. We understand 3D and bring it to the web.
As well as displaying items in a webpage, they are also embeddable - here are a couple of examples below:
You can find out more and try Sketchlab out here