| 20 | | * [http://1978th.net/tokyocabinet/index.html TokyoCabinet] |
| 21 | | * [http://couchdb.apache.org/ CouchDB] |
| 22 | | * [http://code.google.com/p/terrastore/ Terrastore] |
| | 20 | * [http://1978th.net/tokyocabinet/index.html TokyoCabinet] is a library of routines for managing a database. The database is a simple data file containing records, each is a pair of a key and a value. Every key and value is serial bytes with variable length. Both binary data and character string can be used as a key and a value. There is neither concept of data tables nor data types. Records are organized in hash table, B+ tree, or fixed-length array. |
| | 21 | * [http://couchdb.apache.org/ CouchDB] is a document-oriented database that can be queried and indexed in a MapReduce fashion using JavaScript. CouchDB also offers incremental replication with bi-directional conflict detection and resolution. |
| | 22 | * [http://code.google.com/p/terrastore/ Terrastore] is based on Terracotta, so it relies on an industry-proven, fast (and cool) clustering technology. Is a modern document store which provides advanced scalability and elasticity features without sacrificing consistency. |
| | 23 | * [http://neo4j.org/ Neo4j] is a graph database. It is an embedded, disk-based, fully transactional Java persistence engine that stores data structured in graphs rather than in tables. |
