odrive supports syncing to/from various cloud storage services, including Amazon Cloud Drive. I've found it to be a decent piece of software, though the CPU usage is a bit high at times on my Windows 8 machine. Good functionality, though. Access to multiple cloud storage solutions in a Dropbox-like way with a single client program.
EDIT: I've found a solution to the high CPU usage on Windows; if I disable "expand to current location" by right-clicking in the folder pane of File Explorer, then it no longer noticeably bogs the CPU down.
In addition to the Windows (7+) and Mac GUI versions, they also now have a "headless" version which runs on Linux, Windows, or Mac (using Python, so perhaps anywhere Python will run as well?)
So, now I can more wholeheartedly endorse it as something that can provide a Dropbox-like file syncing experience with Amazon Cloud drive.
I also found Cloudberry's offerings to be useful for manually copying back and forth from my older Win XP machine, which odrive will not support.
1http://www.cloudberrylab.com/amazon-s3-powershell.aspx and http://www.cloudberrylab.com/blog/how-to-sync-local-folder-with-amazon-s3-bucket-with-cloudberry-s3-explorer/ – STTR – 2014-11-06T16:28:32.003
Have you tried the Amazon Cloud Drive desktop application? – heavyd – 2014-11-06T16:31:58.203
@STTR S3 != Amazon Cloud Drive. AFAIK, Cloudberry doesn't support Amazon Cloud Drive. – heavyd – 2014-11-06T16:35:05.967
@heavyd desktop app seem to only support manual "drag to upload" or "browse folder to upload" very basic. Guess I will have to look into 3rd party apps that support cloud drive – Yuriy Galanter – 2014-11-06T16:40:13.757
Looking for this on Ubuntu – gap – 2014-11-08T22:30:53.423