Blue 3D app for iPhone and iPad

Blue3D loads Collada (.dae) files from your dropbox and store them locally. After downloading, you can open them directly from within the app. It also registers itself as .dae file opener, it means you can open your email attachment if it has .dae file. It supports Skeleton animation with software and hardware acceleration (bone limit for HW accel is 48 due to iOS uniform limitation)
it is highly optimized for Mobile platform. You can control your model by:
-One finger panning will change camera view point
-Two finger panning will move camera around
-Two finger rotate will rotate model
-Two finger pinch will scale model
-Double click will transform everything back to where you opened them
-Various options including: show FPS, Axis, reference plane, per pixel lighting, solid shading, wireframe mode
-A special presentation mode rotates your model constantly and at the same time, you can also change view port by panning and pinching, so that focus can be on any part of the model

It also can open your camera and take screen shot with camera preview and your model combined, achieving Augmented Reality

The first free app on the market to support Gallery-like browsing. In Blue 3D, a filmstrip is at the bottom which displays thumbnail of your local model, when clicked, it switch to the new model without closing current viewing session