Melanee – The Deep-modeling Domain-specific Language Workbench by Colin Atkins and others
ConceptBase.cc – A Database System for Metamodeling and Method Engineering by Manfred A. Jeusfeld and others
metaDepth: A framework for deep meta-modelling by Juan de Lara and others
Dynamic Multi-Layer Algebra (DMLA) by Z. Theisz and others
MultEcore by Fernando Macias and others
Open MetaModeling Environment by Bernhard Volz and others
Reflector by Dirk Draheim and others
DeepJava by Thomas Kühne and others