The software is freely available for download, but before running in a production environment you should purchase a commercial license. You can get an overview of the license costs on the license conditions page.
We also support the community by providing free of charge licenses for contributing partners. This form of licensing is only suitable for non-commercial users, because the entire product of your work with OpenRate must be shared with us, and will therefore be made available to the community.
For more information about where to get the software, please see: http://www.open-rate.com/content/openrate-v1510-distribution-package-released.