One of the key advantages of Sphinx is that it enables the creation of integrated model-driven tool environments based on multiple metamodels or Domain-Specific Languages (DSLs) and thereby provides a very good interoperability between them. This is an important capability for users who need to work on multiple aspects of a system (e.g., requirements, functional architecture, software architecture, safety) with each of them involving the usage of a specific modeling language or standard. However, so far this interoperability can only be leveraged with modeling tools that are actually based on Sphinx and reuse its common modeling tool backbone, i.e., the Sphinx model workspace management. It would be very useful and a significant step forward if the cross-metamodel/cross-DSL interoperability offered by Sphinx could be extended to non-Sphinx-based modeling tools or even to non-Eclipse-based modeling tools. This could be achieved by providing appropriate connectors and model data exchange services based on the Open Service for Lifecycle Collaboration (OSLC) standard.