Drupal-doctrine is a project mainly written in PHP, it's free.
Drupal and Doctrine integration module
Drupal and Doctrine integration module
This module integrates Doctrine on Drupal 7 CMF. It's a initial version inspired by doctrine module written by Jonnathan Wage (doctrine lead developer) for Drupal 5.x.
Download the Doctrine libraries from http://www.doctrine-project.org and place it in lib/ directory under doctrine module installation directory, as follows:
$ cd drupal_root_installation/sites/default/modules/doctrine $ mkdir lib $ cd lib $ cp -r path_download_doctrine/Doctrine .
I've tested this module in a clean installation of Drupal 7 and works Ok.