CloudKitty is a rating component for OpenStack developed by Objectif Libre to provide metering and charging capabilities. It collects usage data from Ceilometer, applies configurable rating policies to transform the data, and stores the results. CloudKitty's modular architecture allows it to interface with different data sources and billing backends. It provides dashboards and reports to help users track resource usage and costs. Objectif Libre offers CloudKitty as part of its OpenStack consulting and support services.