DragonDisk

DragonDisk is a tool with two very different functions: the first one lets you copy files and folders from one directory on your hard drive to another, while the second lets you easily manage and synchronize your Amazon S3 accounts.

To make things easier, the application lets you choose the kind of view you want: list, tree, or mixed. Whichever you choose, the process of copying files can be performed by simply dragging a document from one side of the program's window to the other.

DragonDisk is a great tool because it's easy to use, letting you conveniently manage one or several Amazon S3 accounts. Everything is done within same window and with just a couple of clicks.