Unfortunately educators AND homeschoolers can no longer get a FREE 1 year license for SketchUp Pro – but the license per year is only $55 so would be worth it if you use it a lot! There are also premium architectural versions as well if you teach at higher levels.
It is available in the US, Canada, AND other worldwide locations. Valid for Mac AND PC versions. This is a 3D building software. To qualify you will be required to provide academic proof before obtaining your license.