Dawn Junior Wildlife Champions is another great resource for Discovery Education, in partnership with Dawn.

The site has three lessons, recommended for grades 3-5, available for download. The lessons contain investigative research, hands-on experiments, and even at-home activities. There are also teacher resources and tools. The lessons are about the issues relating to oil spills and the environment and wildlife.

These lessons can be adapted for use with other grade levels also.

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READ MORE - Discovery Education Dawn Junior Wildlife Champions-free lesson plans about oil spills and wildlife

Google Code University is a collection of free courses on computer science.

There is no registration and all materials are free to use. There are courses on programming languages, web programming, systems and more. There are basic tutorials and advanced classes. Some of the materials are from actual college computer science courses.

This is a great resource for computer science classes and can be used in class or as extra reinforcement.

READ MORE - Google Code University - free computer science classes