Quiz Tree Free online quizzes and games for subjects including math, reading, foreign language, geography, history, science, spelling, music and more.
Fact Monster Great kid-friendly site with all kinds of facts, games, quizzes, etc for many different subjects.
Sheppards Software Hundreds of free of educational games, activities, and articles for many different subjects.
Learning Page Provides a huge collection of free downloadable instructional science materials including esson plans, books, worksheets, etc.
Googol Learning Virtual field trips and resources that inspire math and science.
Easy Fun School Science Science-based lessons and activities for various ages.
U.S. Fire Administration for Kids Lesson plans for basic fire safety.
Yucky Discovery Science website sponsored by Discovery Kids.
Think Zone Print free science & math posters and charts.
MSNucleus Curriculum Access a free K-12 integrating science, math, and technology curriculum. Great resource!