Company 郷 田村 created these great apps:
Factorization(Math Drills), CompSquare(Math Drills), MathDrills(Math Drills), Quadratic(Math Drills), Trigonometry(Math Drills), Probability(Math Drills), Shapes(Math Drills), Locus&Region(Math Drills), Trig Function(Math Drills), Complex(Math Drills), Linear Function(Math Drills), Exp&Log(Math Drills), Calculus(Math Drills), 高校数学, and others..
