Hashicorp has certified the RightScale provider for Terraform, allowing Terraform users to include multi-cloud resources in their configurations. RightScale resources can be provisioned/updated/destroyed/etc using the Terraform tools like any other resource, and allow for building Terraform configurations that can support multiple clouds with one set of files/resources. Additionally, the provider exposes the ability to run arbitrary Cloud Workflow code as part of a configuration, providing a powerful tool for complex configuration tasks as part of a Terraform configuration.
