Google Sketchup

Google Sketchup is a free and easy to use 3D drawing tool. In less than 15 minutes, you and your students can construct 3D drawings. Google is encouraging the use of Sketchup in schools with an open licensing policy.

Flow

Flow is another example of what creatiove designers are doing with online tools. In yhis very beautiful "game", the user directs an aquatic organism that swims, eats, and evolves.