Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.
Power Thesaurus - Power Thesaurus is a fast, comprehensive and easy-to-follow online thesaurus for writers...
GoldenDict - The program has the following features: Use of WebKit for an accurate articles' representation, complete with all formatting, colors, images and links.
English Grammar Test - English Grammar Test app is an app by Sevenlynx that contains features to help users access a variety of online resources and books to learn by adopting a different way.
Wiktionary - Open Source wiki-dictionary by the Wikimedia foundation
Idioms And Phrases - Idioms And Phrases app allows you to enhance your communication and expression skills by reading difficult idioms and phrases.