Did you know that GiD can import .obj files?
From preprocessing just select in top menu Files->Import->OBJ Wavefront mesh…
With this option it is possible to read mesh files with obj format (Wavefront Technologies).
A Star Wars fan? Video CoPilot are giving away a collection of 3D models about the epic franchise! You can download the pack from here.
Just try the .obj importation in GiD with this pack and import meshes of your favourite characters like R2-D2 or BB-8.
May GiD be with you!