SQL database access through PDO.
Data Access PHP Framework for SQL & high-latency databases
Doctrine Database Abstraction Layer
Provides integration for Doctrine with various Symfony components
Easy-to-use PDO wrapper for PHP projects.
The simple PHP router
A drop-in Doctrine ORM 2 implementation for Laravel 5+ and Lumen
ORM
Wrapper for a PHP MySQL class, which utilizes MySQLi and prepared statements.
Propel2 is an open-source high-performance Object-Relational Mapping (ORM) for modern PHP
A fluent, intuitive ORM for any relational database engine
Db component from Zend Framework