CouchDB has PHPillow:
PHPillow is an object orientated wrapper for CouchDB. Releases can be found on the downloads page. Apache CouchDB is a distributed, fault-tolerant and schema-free document-oriented database accessible via a RESTful HTTP/JSON API. Among other features, it provides robust, incremental replication with bi-directional conflict detection and resolution, and is queryable and indexable using a table-oriented view engine with JavaScript acting as the default view definition language.
Also see http://nosql-database.org for a good overview.
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