  The need for real-time collaborative solutions in model-driven engineering
has been increasing over the past years. Conflict-free replicated data types
(CRDT) provide scalable and robust replication mechanisms that align well with
the requirements of real-time collaborative environments. In this paper, we
propose a real-time collaborative multi-level modeling framework to support
advanced modeling scenarios, built on a collection of custom CRDT, specifically
tailored for the needs of modeling environments. We demonstrate the benefits of
the framework through an illustrative modeling case and compare it with other
state-of-the-art modeling frameworks.
