Basho has announced that it has open sourced Riak CS, an S3-compatible object storage system based on the already open source Riak distributed database. Riak CS builds on Riak’s high availability, scalability and fault tolerance and adds the S3 API and authentication mechanisms to allow it to be deployed within private or public clouds as a reliable storage platform. A Riak CS storage cloud can support multiple tenants with per-user level reporting and supports large binary object storage making it suitable for many demanding archival tasks.