Work on I3D began when I was frustrated from the lack of tools available for Linux 3D game development. The Gimp only fills half of the role for 3D game development. So work began on I3D. I3D utilizes a variety of techniques for modelling. You can create splines, meshes, and surfaces. Modify object properties with the mouse or with the object inspector.
Texture map objects for added detail, and fine tune the mapping coordinates with the UVEditor.
Create keyframe animations, using IK and skeletal deformation. You can even animate colors and UV coords. The OpenGL Game Programming Resource is a web site dedicated to exactly what the title says. There you'll find tutorials, links, and things of this nature. The second installment of Greg Magarshak's column, Theory And Practice , is now online.