Wikipedia
MetaDONE
MetaDONE is a software environment for creating domain-specific modeling languages (DSML). MetaDONE is developed by the PReCISE Research Center of the University of Namur ( Belgium). It supports multi-level modeling and is fully bootstrapped. User-defined languages can have several concrete notations that are defined declaratively with the GraSyLa language. This framework proposes several modeling languages ( Business Process Model and Notation (BPMN), User Requirements Notation (URN), Goal-oriented Requirements Language (GRL), Petri Net) that can be freely customized by the users.