The ongoing trend towards a global services economy creates considerable market opportunities for various stakeholders. A service intermediary who offers complex services to customers and consumes services from suppliers and thus creates a service value network, faces the challenge of adhering to agreed service levels while minimizing associated costs, risks and potential penalties. Starting from a lifecycle model for service value networks, this paper identifies the service level management tasks to be performed by a service intermediary. For each of these tasks, supporting software tools have been developed. Together, they form an integrated tool chain which provides effective support for service level management of service intermediaries. The tools have been evaluated in case studies and industrial settings. The paper contributes the first study of an end-to-end service level management for service value networks.