SpellQuizzer Download a free 30-day trial of their spelling software.
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.
Kids Spell Select a spelling list or create your own. Then play fun spelling games.
Easy Fun School Language Arts Language arts lesson and literatute-based activities.