In today's globalized economy, innovations become more and more crucial for the success of enterprises on the global markets. This article presents a reference architecture for an intermediary platform - and surrounding ecosystem - supporting the Open Innovation process in a network of SMEs and related stakeholders. Its main aim is to foster stakeholder dialogue in networked innovation management, but it also offers technical measures for data acquisition. We demonstrate business viability of the platform based on an analysis of involved stakeholders and their requirements.