[setq]

openstack swift supposedly but this is a slightly incompatible S3 implementation that nothing else talks.

The filesystem works pretty well though ;)

[tedmiston]

Ceph / librados provides a compatible layer on top of S3 and Swift.

http://ceph.com/ceph-storage/object-storage/

[5ilv3r]

Swift3 speaks aws4 auth now. The real problem is S3 clients that expect an amazon signed cert. No good way to fake that nicely.