Riak Cloud Storage (Riak CS) is a storage software which can be used to build public or private Cloud storage systems. It is built atop Riak, a distributed database system developed by Basho Technologies, a outfit based in Cambridge, Massachusetts (USA).
Yesterday, the company announced that Riak CS has been released under the Apache 2 license and scheduled a webcast for April 2 (2013).
Riak CS offers a highly available, fault-tolerant storage, with support for large objects (up to 5 GB) and multipart uploading, an API and authentication system that is S3-compatible, multi-tenancy and per-user reporting.
Aside from the freely downloadable Riak CS, there is also Riak CS Enterprise, which offers a few more features, like multi-datacenter replication, monitoring, and 24×7 support.
Download files for Riak CS and related administrative tools for Debian, Fedora, FreeBSD, Mac OS X, Red Hat Enterprise, SmartOS, Solaris, and Ubuntu are available from here. The official announcement and relevant links are available here.