Couchdb

Document database server, accessible via a RESTful JSON API

Couchdb is a document database server, accessible via a RESTful JSON API. It has an ad-hoc and schema-free with a flat address space. CouchDB is distributed, featuring robust, incremental replication with bi-directional conflict detection and management. It features a table oriented reporting engine that uses Javascript as a query language.

WWW http//couchdb.org/