Import/Export out of Unity

Hello. I’ve been fiddling with Unity

I have all these software programs to help create game assets &/or a game.

How do I import .obj, .fbx files into Unity, then export them as an .obj, .fbx, .mat, .stl, .prefab outside of Unity?

Images or a video tutorial would be ideal but if you clearly write the steps, that’s fine too.

Thanks in advance!

Programs I use

3D Creation Suite

Blender

Daz3D

3D Modeling Software

Aartform Curvy

Sculptris
http://pixologic.com/sculptris/
Wings 3D
http://www.wings3d.com/
Poser Pro



Editor/Extensions needed to Import/Export

GameObject to Mesh (OBJ) -Export

Runtime OBJ Importer -Import

To import, just drag them into the project hierarchy, or buy/write a runtime importer.
To export, buy/write an exporter for the target format - like the one you linked at the bottom of your post.