(SpiderOak / Nimbus.io cofounder here) Thanks for your interest! Nimbus.io will have public git repositories, "developed in the open" before we ever charge mo

(SpiderOak / Nimbus.io cofounder here) Thanks for your interest! Nimbus.io will have public git repositories, "developed in the open" before we ever charge money to use the service. We just haven't posted the links yet. :) We admire OpenStack and Ceph as great examples of open source S3 alternatives. Also, Riak+Luwak isn't protocol-level compatible with S3 but offers similar capabilities and an truly elegant design. Nimbus.io takes a different approach than the above options in that it focuses on space efficiency using parity instead of replication, allowing the storage of a little more than twice as much data using the same hardware. It's a tradeoff of cost vs. latency. For long term archival storage, while throughput matters greatly, latency less so. That's why the price is $0.06/GB.