4th Dimension
Adabas D
Aerospike
AllegroGraph
Alpha Five
Altibase
Amazon DynamoDB
Apache Accumulo
Apache Cassandra
Apache CouchDB
Apache Derby
Apache Hbase
Apache JENA
Apache River
Aster Data
BaseX
Berkeley DB
BigTable
BlackRay
CA-Datacom
CDB
CSQL
CUBRID
Clarion
Cloudant
Cloudant Data Layer (CouchDB)
Clusterpoint
Clusterpoint XML database
Clustrix
Coherence
CoreFoundation Property list
Couchbase Server
D3 Pick database
DEX/Sparksee
Daffodil database
DataEase
Database Management Library
Dataphor
Datastore on Google Appengine
Derby aka Java DB
Dynamo
EXASolution
ElasticSearch
Empress Embedded Database
EnterpriseDB
Extensible Storage Engine (ESE/NT)
FileMaker Pro
Firebird
FlockDB
FoundationDB
Freebase
GT.M
GemStone/S
GigaSpaces
Greenplum
GroveSite
H2
HSQLDB
Hazelcast
Helix database
Hibari
Hypertable
IBM DB2
IBM DB2 Express-C
IBM Informix C-ISAM
IBM Lotus Approach
IBM Notes and IBM Domino
InfiniteGraph
InfinityDB
Infobright
Informix
Ingres
InterBase
InterSystems Caché
JADE
Jackrabbit
Keyspace
LevelDB
Linter
MariaDB
MarkLogic
MarkLogic Server
MaxDB
MemSQL
MemcacheDB
Microsoft Access
Microsoft Jet Database Engine
Microsoft SQL Server
Microsoft SQL Server Express
Microsoft Visual FoxPro
Mimer SQL
Mnesia
MonetDB
MongoDB
MySQL
NDBM
Neo4j
NeoDatis ODB
Netezza
NexusDB
NonStop SQL
ODABA
OWLIM
Object database
ObjectDB
ObjectDatabase++
ObjectStore
Objectivity/DB
Ontotext-OWLIM
OpenLink Virtuoso
OpenLink Virtuoso Universal Server
OpenOffice.org Base
OpenQM
Openbase
Oracle
Oracle NoSQL Database
Oracle Rdb for OpenVMS
OrientDB
Panorama
Perst
Pervasive PSQL
Polyhedra
PostgreSQL
Postgres Plus Advanced Server
Progress Software
R:Base
RDM Embedded
RDM Server
Revelation Software's OpenInsight
Riak
Rocket U2
SAND CDBMS
SAP HANA
SAP Sybase Adaptive Server Enterprise
SAP Sybase IQ
SQL Anywhere
SQLBase
SQLite
ScimoreDB
Sedna
SimpleDB
SmallSQL
Solr
Sones GraphDB
SparkleDB
Sqrrl Enterprise
Sybase Advantage Database Server
Tarantool
Teradata
The SAS system
TimesTen
TokuMX
Tokyo Cabinet
Tuple space
UniData
UniVerse
Unisys RDMS 2200
VMDS
Vectorwise
Versant Object Database
Vertica
Virtuoso Universal Server
WakandaDB
XAP
ZODB
dBase
db4o
djondb
eXist
eXtremeDB
mSQL
memcached
mizanSQL
redis
solidDB
txtSQL