The full game can be downloaded for $40. It works on the Mac and PC. The company offers a money-back guarantee. If you don’t like the game, call their refund line. There is also a free version. But it only teaches 2s and 12s.

Links to Learning is an interactive test component which uses state released questions to create CRCT quizzes that are graded immediately, providing corrected answers, explanations, and web recourses for each question.  Click on Georgia. Enter the User name and Password below. Then choose the Grade Level and which Quiz you would like to take.

User Name:    newtonga
Password:   7trial
(case sensitive)
 

This site is loaded. It includes the Columbia Encyclopedia, American Heritage Dictionary, Roget's Thesaurus, and Bartlett's Famous Quotations.

If you need help getting up to speed, this site is excellent. It covers reading, math, science and much more. Much of edHelper appears aimed at younger children. But there's a lot here for older kids, too.

This is Microsoft's encyclopedia, developed from the old Funk & Wagnalls, Collier's and the New Merit Scholar's. This is the abbreviated version. The full experience costs $30 per year. Still, there's a lot here that's free.

Need to look up a word? You're at the right place! It has the American Heritage Dictionary. It also has computing, medical, legal, and financial dictionaries. There are other reference works here, too. Nearly all of it is free.

This site has access to more than 3 million articles, journals and books. The range of topics is all-encompassing.

This site's slogan is "All the knowledge you need." It has a bunch of almanacs—World & News, United States, History & Government, Biography and so on. It also features the Columbia Encyclopedia.

Another site with much of the information found at physical libraries. The nice lady will answer questions, but she takes up to three days. It is hosted by the Drexel University's College of Information Science & Technology.