Grammarly: Grammarly is a free app that many native speakers use to proofread their writing before sending it to others. It helps you improve grammar, spelling, punctuation, and capitalization in your writing, so it can be really useful for writing tasks. It works as a free-standing app on your computer, with plugins available for whichever web browser you use. For mobile devices, you can install the keyboard app, Grammarly Keyboard for improved autocorrect recommendations. Just make sure to set language preferences in the app to make corrections in the format of English you are learning to avoid confusion between British, American, Canadian and Australian variations of the language, and you’re all set!
Write & Improve: If you’re interested in improving your writing in between writing tasks and evaluations, you’ll want to take a look at this site developed by Cambridge to help English students improve their writing skills. You start off by choosing a workbook at your own level. You’ll find various types of writing tasks available on this site, which gives you feedback on your writing as you go to help you improve. Also, since it’s developed by Cambridge, it includes test preparation skills focused on the IELTS Academic and General Training and B2 First certifications.