CloudStock is an Amazon S3 manager and file transfer client. It supports transfers up to 5GB and comes with a local file browser. Push your photos, videos or documents in one click and get a short URL for Facebook, Twitter or any message service. Backup and transfer entire folders using transparent compressed archives.
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S3Anywhere is an Amazon S3 file manager for Android Handsets. It allows managing several S3 buckets. It comes with both handset and S3 file managers. It provides download and upload features. Resume support for download is available. File managers allows renaming, deleting, and copying files. You can view permissions (ACL) on each file.

BucketUpload is an application for Android Google phone. It allows uploading files to an Amazon S3 bucket, Flickr Flickr, any web server or any FTP server . Files could be images, audios, videos or any documents available on your Android device. BucketUpload provides a file browser able to list folders from local file system, sd card and shared content providers.