The Programmers Solid 3D CAD Modeller
In general, this is a wonderful program. A great editor, and it's quite easy to use.
Unfortunately, it really is for programmers. While I can muddle through everything, I'm not a programmer so it's extremely time consuming for me to make anything.
Software > Animation, Video editing >
A Free and open source 3d creation suite and video editor.
3d editing: Said to be very difficult to use, and it is. There is an argument that in mastering it one gains a huge set of capabilities with one tool. I was unable to get that far.
Video editing: Defaults are stupid and features are missing. Maybe it'll be passable in a few years.
SketchUp Make is the free SketchUp version.
So simple it's actually difficult to use.