Are you learning a foreign language using Anki ? Your cards are not complete without quality audio files to accompany your cards. You could record those yourself, but it's a lot of work. AwesomeTTS makes this easy for you by automatically retrieving audio corresponding to your card text.
You can retrieve audio from online dictionaries such as Oxford and Cambridge, online repositories of human-recorded audio files such as Forvo, or from high quality synthetic Text to Speech services such as Google Cloud Text To Speech, Microsoft Azure, IBM Watson, Naver.
Generate audio for your whole deck, or part of it. You can then use these audio files in AnkiMobile/iOS and AnkiDroid. Or, generate audio on-the-fly while reviewing on Anki desktop.