Flashcards

Memrise website -  IOS | Android
Google Play I/O Award Winner for Best App of 2017
IOS App - Learn vocabulary and study grammar

Anki website - IOS | Android
Known for spaced recognition

Quizlet     IOS | Android
Create your own flashcards and study sets or choose from millions created by other students

TinyCards  -  IOS
Made by the team behind Duolingo

Vocabulary.com website - IOS | Android

Cram  - website   IOS | Android  
Multiple languages

Magoosh -    iTunes Preview | Google Play  
Multiple sets of Flashcards

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“Spaced Recognition: Never Forget Vocabulary Again”
From Fluentin3Months.com
Learn English Vocabulary: 10 Amazing English Flashcard Apps
From Fluentin3Months.com