EMF Views is an Eclipse plugin that brings the concept of database views to the modeling world
JTL is an EMF-based tool that allows you to design and manipulate models, maintain consistency and synchronize software artifacts, keep traceability during design.
Moka extensions provides a number of plugins that extend the functionality of Papyrus Moka engine for fUML simulation:
Performance-driven softwAre moDel Refactoring framEwork (PADRE)
Papyrus extensions offer a number of plugins that extend the functionality of Papyrus UML for Aspect Oriented Modeling (AOM).