Company Lan Huong created these great apps:
TOEFL listening - synced transcript, IELTS listening - synced transcript, Master TOEFL, IELTS speaking, English Etymology - combined version, Model Essays for TOEFL, IELTS, Dictionary of Paraphrases, German Word and Name Origins, Homophone Dictionary, Mastering English Collocations, Dictionary of obscure words, English Anagram Dictionary, Dictionary of German family names, German Origin Dictionary, German Proverbs and Idioms, Oldest, Foreign, Obscure Words, German Writing Guide, Semitic Root Dictionary, German Idiom Dictionary, English Adjective Preposition Collocations, Verb Preposition Collocations, Old English - English Dictionary, American and Australian Slang, IELTS Topic Vocabulary in Use: quiz, flashcard, and others..
