Quote: "Hi, are there any free , 3D modeler, world editor or terrain generators that can export to formats used in DGDK?"
Yes, there are many.
Blender - a popular and free 3D modeler/animator - http://www.blender.org/
Anim8or - 3D animation program - http://www.anim8or.com/
Wings 3D - subdivision modeler - http://www.wings3d.com/
Terrain Generator* - a free terrain generator - http://nemesis.thewavelength.net/index.php?p=8
FreeWorld3D** - Awesome terrain/world editor - http://www.freeworld3d.org/index.html
* Note that Dark GDK can only import/load 3DS, X, DBO, MD2, MD3
and MDL files. Terrain Generator can't export to any of these files, so you'll have to save any created terrain as an .obj file and convert it. One way of converting it is to use Blender (http://www.blender.org/) and using its export options to export to 3DS. If you don't like Blender then search on Google for "3DS exporter" (no quotes).
** FreeWorld3D is a program I Googled- it isn't free but it looks cool so I wanted to share it with you.
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