Company TheMotivators, Inc created these great apps:
6th Grade Vocabulary (Ages 11-12+), 5th Grade Vocabulary (Ages 10-11+), FlashMath (Ages 7+), DigitiZer (Ages 7+), TimezBlaster (Ages 7+), Pinyin Rx, Geography Plus (Ages 7+, Grade 3+ ), Science Vocabulary (Ages 7+, Grade 3+), GRE Verbal Rx (600 Words), SAT Verbal Rx (300 Words), WordStarZ (Vocabulary for Grades 3-4, Ages 8-10), iUseMyBrain2 (Grade 3+, Age 8+), Science Vocabulary (Ages 9+, Grade 5+), WordStarZZ (Vocabulary for Grades 5+, Ages 9+), getSMART for Students, and others..
