S3 Browser is a freeware Windows client for Amazon S3 and Amazon CloudFront. It is a freeware Amazon browsing application that's well-designed and easy-to-use.
Here is a screenshot to illustrate the features and user interface of this application:
Manage Amazon accounts and share or publish files on the website with great ease. Screenshot of S3 Browser - 560px · 459px
MEGAsync
Dropbox
Google Backup and Sync
Google Drive
Microsoft OneDrive