For hobby I have a site where I sell models for cnc carving. I was looking for a way to have an online model Viewer but didn't want to go the plug-in route...figured most vistors will not download a plug-in. Tried wirefusion but could never get the open gl to work right..plus it's very pricey for a hobby. Anyways I stumbled across the 3d engines for flash player 11..very cool...hard for me to figure out but figured it out enough to create a viewer based off their online viewer. Best part FREE...lol I tried away3d, flare 3d and settled on Alternativa

http://alternativaplatform.com/en/

http://a3dplayer.com/

pretty cool way to show a model online with no plug-in..well a plug that 90% of people have. You need flash player 11 for it to play