Cycle is a PHP DataMapper ORM and Data Modelling engine designed to safely work in both classic and daemonized PHP applications such as RoadRunner.
Read more in the official Cycle documentation.
This package provides a convenient way to integrate it with Yii framework.
There is also an additional package providing Cycle ORM query adapter for Yii Data called Yii Data Cycle. You can use it independently or in combination with this package.