I found Wings3D after an unsuccessful struggle for getting to know Blender. It really impressed me, since it's quite easy to use. Besides, after having tried Cheetah3D (for Mac), it seemed to me that both Wings3D and Cheetah3D have a very similar way of controlling the scene and moving the camera, and I did like this.

I remember using the old Nendo program, and this is very similar. For quick model making this works really nice. I would use this with Blender, but nowadays I prefer to only use Blender.