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Hibernate is a powerful, high performance object/relational persistence and query service. Hibernate lets you develop persistent classes following object-oriented idiom - including association, inheritance, polymorphism, composition, and collections. Hibernate allows you to express queries in its own portable SQL extension (HQL), as well as in native SQL, or with an object-oriented Criteria and Example API.

Unlike many other persistence solutions, Hibernate does not hide the power of SQL from you and guarantees that your investment in relational technology and knowledge is as valid as always. The LGPL open source license allows the use of Hibernate and NHibernate in open source and commercial projects.

• Object-relational bridge (ORB)
• Built on PDO, the standard DB layer for PHP 5.1+
• 2.x provides E_DEPRECATED and E_STRICT compliance for PHP 5.1+
• 1.x works with PHP 4 by providing PDO emulation
• Ultra-light approach with minimal script overhead
• Database platform agnostic, including data imports / exports
• Promotes optimized, platform-specific code
• Forward-engineering of code and metadata from xPDO schema in seconds.
• Reverse-engineering of existing databases into an xPDO schema in seconds.
• Result set caching that can utilize memcached, or a simple file-based cache, or a custom cache implementation of your own design.
• Supports JSON caching as well, to help maximize performance with AJAX applications.

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.