Propel ORM Alternatives
Propel ORM is described as 'Propel is an open-source Object-Relational Mapping (ORM) for SQL-Databases in PHP 5.5' and is an app in the development category. There are four alternatives to Propel ORM for Self-Hosted solutions. The best alternative is RedBeanPHP, which is both free and Open Source. Other great apps like Propel ORM are SchemaDB, Pork.dbObject and PHP ActiveRecord.
RedBeanPHP is an easy to use ORM for PHP. It's a Zero Config ORM lib that 'automagically' builds your database schema.
Use SchemaDB to manage Database Schema and Records directly from PHP code without using PhpMyAdmin.
Features
It's an Object-Relation mapper for PHP 5 that attempts to be easy, fast, lightweight, uses optimized database queries and provides an easy Find() function very loosely based on rails'. Also, it has an automatic database analyzer and code generator.
PHP ActiveRecord is an open source ORM library based on the ActiveRecord pattern. It aims to massively simplify the interactions with your database and eliminate the chore of hand written SQL for common operations.