Is this what you're asking: "Is it there any easy way to get models into the right format for Glest?"?
If so, then yes it's actually really easy. You do have to use Blender or 3DS to export the model, but you can actually make the model in whatever program you want as long as it exports to a format that Blender can import. This includes wavefront (.obj), collada (.dae), and many others. Once you create the model in your program, export it, import it into Blender, and then export it as a Glest model (g3d) format. Simple.
What program do you use, anyway?