https://www.khanacademy.org/
This site holds thousands of videos, interactive lessons, and assessments on a wide range of topics.

http://www.livebinders.com/
This site is just like a 3-ring binder except online. Instructors can use it to organize material in a course so that students have easy access to the material.

prezi.com
A presentation website that exceeds the capabilities of PowerPoint by capturing the audiences attention in a variety of ways.