A free program for Android, by maxlogix.

English Grammar Lite is an application to learn the basics of English grammar. The app has been designed in a way that it can be used easily and conveniently by people of different ages and educational backgrounds. The app is perfect for students who want to improve their grammar and vocabulary. The user interface is simple and intuitive, which allows users to focus on the lessons without getting confused by the complexity of the application.

It contains many lessons including synonyms, verbs, articles, and prepositions.