There are loads of tools out there built around the AWS APIs. In response to that, some software comes with an AWS compatibility layer. One of them is EMC Atmos.
There's a surprising lack of documentation on how to actually use this compatibility. The best I could find is the "EMC® Atmos™ Version 2.1 Programmer’s Guide P/N 300-013-493 REV 01". However, all it does it tell you that the S3 compatibility is hosted on a different port, and which operations are supported. It doesn't give any hints on how to get any tools working.
The main gotcha seems to be that the S3 API has both a path and DNS based way of accessing buckets. It's important to use the path based mechanism.
JetS3t