I studied English/Literary studies. I currently teach English language. I find these apps so useful and only wish I had it back then in school. Here's to hoping you enjoy using them too.
1. LitCharts: this app was developed by the same people who created Sparknotes. It has over 200 books summarized and analyzed with notes on themes, symbols etc. It even works offline. Here are some of the novels included: things fall apart, a portrait of the artist as a young man, beowulf, the Aeneid, Agamemnon, Antigone, Canterbury Tales, Shakespeare's works, the Greek classics such as Iliad and many more. All Chimamanda's works are included.
2. Shakespeare Pro: well, this beats logging the complete works of Shakespeare around. All the plays, sonnets etc for free. The only paid feature is the search and bookmark function which you can easily work your way around with the last viewed feature. My favorite part of this app is the lamb's tales from Shakespeare tucked away at the bottom. It summarizes the major plays ever so neatly.
3:Literary Terms : this one is a dictionary of literature. All those figures of speech and other terms. Still learning new terms from it every other day.
4. Jane Austen Book Collection : pretty self explanatory title. I am a big fan.
5. Tophonetics: transcribes words, phrases and sentences into phonics for you. A most useful app.
6. Phrasalstien: a cool app that uses animation to teach phrasal verbs. Also look up phrasal verb machine, both are made by the same people. I have both.
7.Basic Linguistics : it's a useful textbook. You get to save some money. LAD, phonetics/ phonology etc are all there.

Still working on more

*these apps. Sorry for the typos

8. Phonemic Chart: makes learning and memorizing those phonics so much easier. Please add more to the list. I look forward to learning about other apps like the ones above.