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NoSQL - groups of tables of data without SQL. Used to be called dBase

Which one to study? My money is on Oracle NoSQL. I know they will be around and a business may like having a big name backing it.

List on NoSQL database from WikiPedia ( http://en.wikipedia.org/wiki/NoSQL ) :
Eventually?consistent key?value store
Apache Cassandra
Dynamo
Hibari
OpenLink Virtuoso
Project Voldemort
Riak[11]

Hierarchical keyvalue store
GT.M[12]
InterSystems Cach

Hosted services
Freebase
OpenLink Virtuoso
Datastore on Google Appengine
Amazon DynamoDB
Cloudant Data Layer (CouchDB)

Keyvalue cache in RAM
memcached
OpenLink Virtuoso
Oracle Coherence
Redis
Hazelcast
Tuple space
Velocity

Keyvalue stores on solid state or rotating disk
ArangoDB
BigTable
CDB
Ceph
Couchbase Server
Keyspace
LevelDB
MemcacheDB
MongoDB
OpenLink Virtuoso
Tarantool
Tokyo Cabinet
Tuple space
Oracle NoSQL Database

Ordered keyvalue stores
Berkeley DB
IBM Informix C-ISAM
InfinityDB
MemcacheDB
NDBM

Multivalue databases
Northgate Information Solutions Reality, the original Pick/MV Database
Extensible Storage Engine (ESE/NT)
jBASE
OpenQM
Revelation Software's OpenInsight
Rocket U2
D3 Pick database
InterSystems Cach
InfinityDB

Object database
Main article: Object database
db4o
Eloquera
GemStone/S
InterSystems Cach
JADE
NeoDatis ODB
ObjectDB
Objectivity/DB
ObjectStore
OpenLink Virtuoso
Versant Object Database
Wakanda
ZODB

]RDF database:
Meronymy SPARQL Database Server

Tabular
Apache Accumulo
BigTable
Apache Hbase
Hypertable
Mnesia
OpenLink Virtuoso
]Tuple store
Apache River
OpenLink Virtuoso
Tarantool