CHESS
CHESS implements the CHESS UML/SysML profile, a specialization of the Modeling and Analysis of Real-Time and Embedded Systems (MARTE) profile
Collaboro
Collaboro makes language development processes more participative: both developers and users of the language can collaborate together to create and evolve it.
Modelio Constellation
Constellation organizes and manages collaborative (distributed) World Wide Modeling projects,
RCRS
RCRS (the Refinement Calculus of Reactive Systems) is a compositional reasoning framework