Grammarly - Clear, effective, mistake-free writing everywhere you type.
Machine Learning Flashcards - 300 digital flashcards
Grammar Snob - Markup your friends' iMessages like an English teacher 😁
Fresh Cards - Flashcards that just work
Deep Grammar - Grammar checker based on deep learning
Anki - Anki is a program which makes remembering things easy. Because it's a lot more efficient than traditional study methods, you can either greatly decrease your time spent studying, or greatly increase the amount you learn.