google account

Online synchronization tool for box.net; free 10 GB account.

Access your Gmail account directly from your Mac's menu bar.

Cloud storage and file syncing service, similar to Dropbox; free 15GB account.

Automatic online backup; free 5GB account (was iDriveforMac).

Upload to and download from your Amazon Cloud Drive; free 5GB account.

Infinite cloud storage accesible from anywhere; free 10 GB account.

Download photos and photosets from a Flickr account.

Finder-accessible remote storage; free 5GB account.

Create an iCloud folder to easily sync files to your iCloud account.

Online backup service; free 2GB account.