I recently came across minio[1] and was blown away. It is feature complete and comes with a beautiful web interface, though you can't delete files via the web interface yet[2].

[1] https://github.com/minio/minio [2] https://github.com/minio/miniobrowser/issues/154

I spent a few months sporadically testing various object-stores (camlistore, seaweedfs, etc) and didn't ever come across that.

A fully self-hosted storage system that presents the Amazon S3 API? That's awesome.