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Also ceph (& swift) are known to scale well in prod. clusters with over 30+ PB of data (at least looking at CERN's cluster) and the latest version of RGW does support geographic redundancy for S3 like apis

+1 for Ceph. We're running several ~3.5 PB clusters in production. We've not taken advantage of the new RGW features in Jewel, but it works well as an object storage solution.

Don't forget:

manta - https://www.joyent.com/manta

CEPH is a volume service not an object storage service.

SWIFT is indeed analogous to S3.

Ceph is object storage first. The volume service is implemented on top of that.

Come on, I literally linked to a website describing "CEPH OBJECT GATEWAY S3 API"