Padlet - Visual boards for organizing anything.
dbinbox - dbinbox makes it easy to send files
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.
Send To My Cloud - Let your users upload files to your cloud storage
Quizlet - Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
UploadTo - UploadTo helps to share and receive large files into a Google Drive or Dropbox account without asking uploaders to login