| MacigaCSG have only .PLY Export, but you can 
import .PLY in Blender and also 3DCoat 
 
For .OBJ Export you could try the free Version 
of "Womp 3D" this is also a SDF-Modeler (online Tool)
 
as a newest Feature (still experimental) it have also 
.OBJ  import and even .Blend Files from Blender
 
and ! very unique it have a Text Tool
 
Here the Link
https://womp.com/index |