Arabic Teaching Aid s is a mobile adaptation of the excellent Digital Teaching Aids from Dr. V. Abdur Raheem's website here. Dr. V. Abdur Raheem is the world renowned author of دروسُ اللغةِ العربيةِ لـغير الناطقين بـها Durûs al-Lughah al-‘Arabiyyah li-Ghair al-Nâtiqîna Bihâ among many other great books.