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dibi is tiny 'n' smart database abstraction layer for PHP 5. It is designed with simplicity in mind. dibi is free (released under the terms of the dibi license). You can use it to develop either open source or commerical applications.
The sfPropelActAsNestedSetBehaviorPlugin is a symfony (http://www.symfony-project.com) plugin that provides nested set capabilities to Propel objects. This environment is used by plugin maintainers to discuss about the project. Official documentation and sources can be found on symfony's website.