Apache !CouchDB™ is a database that uses JSON for documents, JavaScript for MapReduce queries, and regular HTTP for an API.

There are few !CouchDB related elisp packages:

* CouchdbDocument -- open, edit and save !CouchDB document as normal file.
* [http://edward.oconnor.cx/elisp/couchdb.el couchdb.el] -- An Emacs Lisp client library for !CouchDB.
* [http://github.com/cinsk/emacs-sofa emacs-sofa] -- !CouchDB API with native interface like Futon. ([http://www.cloudant.com Cloudant] is also supported as well as !CouchDB)