3D model viewer suitable for browsing 3D models on Android. Many popular 3D formats are supported.

The supported all formats are :
OBJ (*.obj) GLTF (*.gltf *.glb) COLLADA (*.dae) Draco (*.dra) PLY (*.ply) STL (*.stl) FBX (*.fbx) MMD (*.pmd *.pmx) VRML (*.wrl *.wrz) AMF (*.amf) LightWave (*.lwo) 3DS (*.3ds) X (*.x)

The supported formats for paid :
FBX (*.fbx) MMD (*.pmd *.pmx) VRML (*.wrl *.wrz) AMF (*.amf) LightWave (*.lwo) 3DS (*.3ds) X (*.x)

Also comes with a model export feature.
The supported exportable formats are :
OBJ (*.obj) GLTF (*.glb) COLLADA (*.dae) PLY (*.ply) STL (*.stl)

Other features :
- Switching wireframe visibility
- DIsplaying point cloud
- X-ray-like perspective
- Switching spot light
- Switching axes helper
- Selecting scene background color
- Shooting screenshots of model
- Automatic detection of 3D format

All basic features are free.
Please give it a try !