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 !

3D model viewer that supports many formats. There is also a export feature.