Hibari "big data" database released

Riak is AP of CAP, where as Hibari appears to be CA. Both are KV-stores, which means you can't query by values, only keys. (Although Riak has map-reduce, wherein you process *all* key/values.)

(One thing to be careful of: Riak has multiple storage backends, so benchmark results can differ wildly depending on which you choose.)

> a nosql database which is written in erlang and has been around for awhile now

That also describes CouchDB, for what it's worth. (Not much. Organizing database projects by language isn't useful. Writing something in Erlang doesn't make it scalable, distributed or multi-core any more that writing it in C.)