NASA home page has loads of science and technology based information, that is put into a graphical and interactive format. It covers a wide range of topics beyond space related topics.
Sometimes students feel embarrassed to talk in Spanish in front of the whole classroom. So, why not create their own avatar to do it! They can choose form a wide variety of graphics. Great tool for foreign language, upload your own voice!
This is a site only for creating diagrams. It's another way of helping you organize your ideas. This could be used by a teacher who needs help in designing a lesson plan, or it could be used in the actual lesson plan to help students understand certain, confusing concepts.