S3fm is described as 'FREE online file manager for your Amazon S3 account. Share files with your friends and colleagues online' and is an website in the File Management category. There are three alternatives to S3fm, not only websites but also apps for a variety of platforms, including Windows, iPad, iPhone, Linux and Mac. The best alternative is Jungle Disk, which is free. Other great sites and apps similar to S3fm are MSP360 Explorer (Freemium) and Cloud Turtle (Free).
Jungle Disk is a leading provider of online storage software and services, leveraging the Amazon S3 platform and Rackspac infrastructure to provide easy to use and cost effective online storage and backup to our customers.
MSP360 Explorer provides a user interface allowing to access, move and manage files across your local storage and the cloud storage of your choice. Cloud file management software by MSP360 is available in two versions: Freeware and PRO.