Q:

OpenSource or paid JavaScript based file manager for Amazon S3

Does anyone know of a good JavaScript based file manager that works with Amazon S3 Web Services. I need something like http://ckfinder.com, but that works directly with S3. Something like this would be great: http://s3fm.com
I will need both upload and download and it would be nice to have some kind of integration with Amazon S3's ACL security.
I will be using this in an ASP.NET MVC project, so if it has any server side integration it would be nice if it was in .Net.
The only option I can come up with right now is cracking open the http://ckfinder.com code open and writing a plugin.

A:

Check out the filemanager from Core Five Labs:
http://labs.corefive.com/2009/10/30/an-open-file-manager-for-ckeditor-3-0/
I was able to quickly create a connector for Amazon S3 using .net.  I used the Affirma.Threesharp library for S3 access and did it with WebForms, I'm sure it wouldn't be too much different with MVC.

