Dropbox is a file hosting service that provides cloud storage, file synchronization, and can be used as a file-sharing service.
Google Docs is a free Web-based application in which documents and spreadsheets can be created, edited and stored online.
Shareable, Dropbox-like storage held in Canada and available across multiple devices.
Microsoft (MS) OneDrive is a file hosting and synchronization service operated by Microsoft, as part of their suite of MS 365 applications. MS OneDrive allows you to securely store, share, and synchronize files and folders from anywhere at anytime.