Avokado - Language learning app
Padlet - Visual boards for organizing anything.
StudySmarter - Your lecture notes, flashcards, summaries, learning with friends, statistics, and even rewards for learning - all in one place and just a click away - StudySmarter.
BookWidgets - BookWidgets is an excellent application that let you create engaging exercises in minutes and easily share a varied variety of beautiful and fun activities with your classroom and others.
LaTeX Cards - The mobile app to create cards to learn your formulas and theorems using LaTeX.
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.