Compass Learning
http://compasslrng.sacs.k12.in.us/clologin.aspx

Brain Pop
http://www.brainpop.com/

Mr. Anker Tests
This is a great website that has multiple grade levels and subject matter for students to sharpen their skills. http://henryanker.com/

Arcademics
Is online educational video games that offer an effective approach to learning basic math. vocabulary, language and thinking skills.
http://www.arcademicskillbuilders.com/