Doctrine 2 vs Propel: What are the differences?
What is Doctrine 2? An object-relational mapper (ORM) for PHP 5.3.2+ that provides transparent persistence for PHP objects. Doctrine 2 sits on top of a powerful database abstraction layer (DBAL). One of its key features is the option to write database queries in a proprietary object oriented SQL dialect called Doctrine Query Language (DQL), inspired by Hibernates HQL.
Doctrine 2 can be classified as a tool in the "Object Relational Mapper (ORM)" category, while Propel is grouped under "Machine Learning Tools".
Propel is an open source tool with 2.81K GitHub stars and 81 GitHub forks. Here's a link to Propel's open source repository on GitHub.