LanguageTool - Free proofreading tool for OpenOffice, LibreOffice, Firefox, and Chrome.
English Grammar Master - English Grammar Master app is an offline grammar guide that allows users to master their English grammar skills by learning about a large number of topics and techniques.
Grammarly - Clear, effective, mistake-free writing everywhere you type.
EssayToolBox - EssayToolBox features lots of tools that checks any writing for grammar and spelling mistakes, detect plagiarism, brainstorms ideas, generates summaries and conclusion, counts words, and much more.
WhiteSmoke - WhiteSmoke software products for writing and language. WhiteSmoke is a grammar checker, spell checker, style checker and more - in a single package. Also featuring translation software and English video courses.
English Essays by Urva Apps - English Essays is an app by Urva Apps that contains features so you can access a complete guide to learn about how to write an essay by using professional tips right at your fingertips.