3D Design
AutoCAD
Pro-level CAD 3D design software, learning tools and programs.
Blender
3D Modeling, animation, rendering, video editing, game creation and more.
PTC Creo
Powerful & versatile CAD software free for students only.
Sketchup
Sketchup is a great free 3D drawing program, with lots of fun features.
Sketchup comes with a fantastic tutorial popup that opens beside your window, offering visual, animated tool tips as you work.
The software has a very active community and you can download all kinds of finished objects and buildings from the Google Sketchup 'Warehouse'.
If you are doing anything with landscape, building or interior design, or just want to play with perspective, give it a try.
Tinkercad
Free browser-based CAD tool by Autodesk