LessQL: A lightweight and performant PHP ORM alternative
PHP Database Migrations for Everyone
ORM layer that creates models, config and database on the fly
A lightweight nearly-zero-configuration object-relational mapper and fluent query builder for PHP5.
Doctrine Database Abstraction Layer
Analogue ORM : Data Mapper ORM for Laravel/PHP
Lightweight and high-performance ORM with clean object design
Well-integrated Doctrine2 ORM for Nette Framework
ATK Data - Data Access Framework for high-latency databases (Cloud SQL/NoSQL).