DragonDisk is a powerful file manager for S3 compatible cloud storage service, such as Amazon S3®, Google Cloud Storage® and Cloudian® powered clouds.
It allows you to backup, share and organize your data thanks to an intuitive interface similar to Windows Explorer's. Its functions and conviviality will persuade you from the start, whether you are an amateur or a professional user.

DragonDisk is freeware and cross-platform, it works on Windows, Mac OS X and Linux.