A free program for Android, by Esteban Arredondo.
Retron is the most complete application for learning English and Spanish. This way, you won't have to spend money on language classes. In this app, you can learn how to deal with different situations, like talking to a person for the first time, going to the supermarket, and more.
The app has different dialogues between two or more people that you can listen and then you can practice the dialogue with Retron in a question-and-answer format to hone your speaking skills. It also offers grammar exercises for improving your fluency in English or Spanish.
